Android代码速查，写给新手的朋友们

jopen 10年前

0 android 创建按钮

Button button = new Button(this);

1 android 创建输入框

EditText editText = new EditText(this);

2 android 创建文本

TextView textView = new TextView(this);

3 android 设置文本显示内容
TextView textView = new TextView(this);

textView.setText("hello world!");

4 android 设置文本背景色
TextView textView = new TextView(this);

textView.setBackgroundColor(Color.YELLOW);

5 android 设置文本颜色
TextView textView = new TextView(this);

textView.setTextColor(Color.YELLOW);

6 android 设置文本文字大小
TextView textView = new TextView(this);

textView.setTextSize(18);

7 android 设置输入框宽度
EditText editText = new EditText(this);

editText.setWidth(200);

8 android 设置输入框为密码框
EditText editText = new EditText(this);
editText.setTransformationMethod(

PasswordTransformationMethod.getInstance());

9 android 设置输入框为密码框（xml配置）

android:password="true"

10 android 提示对话框的使用
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("你好");
builder.setPositiveButton("OK",this);
builder.show()

需实现android.content.DialogInterface.OnClickListener接口

11 android ListView的使用
ListView listView = new ListView(this);
ArrayList<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>();
SimpleAdapter adapter = new SimpleAdapter(this,list,R.layout.list,new String[]{"标题"},new int[]{R.id.TextView01});
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);
然后实现OnItemClickListener接口

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {}

12 android 更新ListView
ListView listView = new ListView(this);
ArrayList<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>();
SimpleAdapter adapter = new SimpleAdapter(this,list,R.layout.list,new String[]{"标题"},new int[]{R.id.TextView01});
listView.setAdapter(adapter);

adapter.notifyDataSetChanged();//通知更新ListView

13 android 创建LinearLayout

LinearLayout layoutParant = new LinearLayout(this);

14 android 时间设置对话框的使用
DatePickerDialog dlg = new DatePickerDialog(this,this,year,month,day);
dlg.show();
/year month day 均为int型，第二个参数为this时，该类需要implements OnDateSetListener并重写

public void onDateSet(DatePicker view, int year, int monthOfYear,int dayOfMonth) {}/</p>

15 android 创建FrameLayout

FrameLayout layout = new FrameLayout(this);

16 android 触发键盘事件
layout.setOnKeyListener(this);
//需要implements OnKeyListener并重写以下方法
public boolean onKey(View v, int keyCode, KeyEvent event) {
return false;//返回是否销毁该事件以接收新的事件，比如返回true按下时可以不断执行这个方法，返回false则执行一次。

}

17 android 触发鼠标事件
layout.OnTouchListener(this);
//需要implements OnTouchListener并重写以下方法
public boolean onTouch(View v, MotionEvent event) {
return false;//返回是否销毁该事件以接收新的事件，比如返回true按下时可以不断执行这个方法，返回false则执行一次。

}

18 android 获得屏幕宽度和高度
int width = this.getWindow().getWindowManager().getDefaultDisplay().getWidth();

int height =this.getWindow().getWindowManager().getDefaultDisplay().getHeight();

19 android 布局添加控件
LinearLayout layout = new LinearLayout(this);
Button button = new Button(this);

layout.addView(button);

20 android intent实现activit之间跳转
Intent intent = new Intent();
intent.setClass(this, DestActivity.class);

startActivity(intent);

21 android intent设置action
Intent intent = new Intent();

intent.setAction(intent.ACTION_DIAL);

22 android intent设置data
Intent intent = new Intent();

intent.setData(Uri.parse("tel:00000000"));

23 android intent传数据
Intent intent = new Intent();

intent.putExtra("data", value);//value可以是很多种类型，在接收activity中取出后强制转换或调用相应类型的get函数。

24 android intent取数据
String value = (String)getIntent().getExtras().get("data");
//or

String value = getIntent().getExtras().getString("data");

25 android 利用paint和canvas画图
setContentView(new MyView(this));
class MyView extends View
{
public MyView(Context context)
{
super(context);
}
public void onDraw(Canvas canvas)
{
Paint paint = new Paint();//创建画笔
paint.setColor(Color.BLUE);//设置画笔颜色 canvas.drawRect(0, 0, 100, 100, paint);//画个正方形，坐标0，0，100，100。
}

}

26 android 新建对话框
Dialog dialog = new Dialog(this);
dialog.setTitle("test");//设置标题
dialog.addContentView(button,new LayoutParams(-1,-1));//添加控件,-1是设置高度和宽度充满布局，-2是按照需要设置宽度高度。

dialog.show();

27 android 取消对话框

dialog.cancel();
28对View类刷新显示
view.invalidate();//通过这个调用view的onDraw()函数
28 android 对View类刷新显示
view.invalidate();//通过这个调用view的onDraw()函数
29 android 使用SurfaceView画图
setContentView(new MySurfaceView(this));
class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback
{
SurfaceHolder holder;
public MySurfaceView(Context context)
{
super(context);
holder = getHolder();
holder.addCallback(this);
}
class MyThread extends Thread
{
public void run()
{ Canvas canvas = holder.lockCanvas();  Paint paint = new Paint();paint.setColor(Color.YELLOW); canvas.drawRect(100, 100, 200, 200, paint);
holder.unlockCanvasAndPost(canvas);
}
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {
}
public void surfaceCreated(SurfaceHolder holder) {
new MyThread().start();
}
public void surfaceDestroyed(SurfaceHolder holder) {}
}
30 android 获得控件findViewById
TextView textView = (TextView) findViewById(R.id.TextView01);
31 android 十六进制设置画笔颜色
Paint paint = new Paint();
paint.setColor(0xffffffff);//第一个ff是透明度的设置。
32 android 获得String.xml中配置的字符串
//在activity中直接调用
getText(R.string.app_name);
33 android 去掉应用程序头部
requestWindowFeature(Window.FEATURE_NO_TITLE);
34 android 使用SharedPreferences写入数据代码
getSharedPreferences("data", 0).edit().putString("aa","bb").commit();
35 android 使用SharedPreferences读取数据代码
String data = getSharedPreferences("data", 0).getString("item","");//后面的""是默认值，没有取到则赋值为""，如果不想有默认，可以设置null。
36 android 继承SQLiteOpenHelper
class MyHelper extends SQLiteOpenHelper
{
public MyHelper(Context context, String name, CursorFactory factory,int version) {
super(context, name, factory, version);
}
public void onCreate(SQLiteDatabase db)
{
db.execSQL(
"CREATE TABLE IF NOT EXISTS testtable (" +
"cardno integer primary key," +
"username varchar," +
"money integer"+
")");
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
db.execSQL("DROP TABLE IF EXISTS testtable");
onCreate(db);
}
}
37 android 利用SQLiteOpenHelper打开数据库
MyHelper dbHelper = new MyHelper(this, "testtable.db", null, 1);
SQLiteDatabase db = dbHelper.getReadableDatabase();//打开只读
//或者
SQLiteDatabase db = dbHelper.getWritableDatabase();//打开可写
38 android 查询数据表并显示结果
Cursor cursor = db.query("testtable", null, null, null, null, null, null);
//db的获得请参见“利用SQLiteOpenHelper打开数据库”
while(!cursor.isAfterLast()){
Log.i("test",cursor.getString(0));
cursor.moveToNext();
}
39 android Logcat输出打印测试信息
Log.i("TAG","TEST");
40 android 数据表插入数据
ContentValues values = new ContentValues();
values.put("username","admin");
values.put("money","10000");
db.insert("testtable", null, values);
41 android 使得应用全屏
getWindow().setFlags(WindowManager.LayoutParams. FLAG_FULLSCREEN,WindowManager.LayoutParams. FLAG_FULLSCREEN);
42 android 设置LinearLayout方向为竖
layoutParant.setOrientation(LinearLayout.VERTICAL);
43 android 设置LinearLayout方向为横
layoutParant.setOrientation(LinearLayout.HORIZONTAL);
44 android 数据库更新数据
ContentValues values = new ContentValues();
values.put("username","admin");
values.put("money","10000");
db.update("testtable",values,"userno=1",null);
45 android 数据库删除数据
db.delete("testtable","userno=1",null);
46 android 判断sd卡是否存在
if (android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED))
{
Log.i("test","SDCARD exists");
}
else {
Log.i("test","SDCARD doesn't exist");
}
47 android 创建ImageView
ImageView view = new ImageView(this);
view.setImageResource(R.drawable.icon);
48 android 提示信息
Toast toast = Toast.makeText(this, "hello", Toast.LENGTH_LONG);
toast.show();
49 android 创建单选框以及单选组
RadioButton radioButton = new RadioButton(this);
RadioButton radioButton2 = new RadioButton(this);
radioButton.setText("yes");
radioButton2.setText("no");
RadioGroup radioGroup = new RadioGroup(this);
radioGroup.addView(radioButton);
radioGroup.addView(radioButton2);
50 android 新建播放器
MediaPlayer MediaPlayer = new MediaPlayer();
51 android 媒体播放器使用
//创建MediaPlayer
MediaPlayer player = new MediaPlayer();
//重置MediaPlayer
player.reset();
try {
//设置要播放的文件的路径  player.setDataSource("/sdcard/1.mp3");
//准备播放 player.prepare();
}
catch (Exception e) {}
//开始播放
player.start();
//设置播放完毕事件
player.setOnCompletionListener(new OnCompletionListener(){
public void onCompletion(MediaPlayer player) {
//播完一首循环try {
//再次准备播放 player.prepare();
} catch (Exception e) {} player.start();
}});
52 android 媒体播放器暂停
player.pause();
53 android 清空cookies
CookieManager.getInstance().removeAllCookie();
54 android 文本设置粗体
TextView textView = new TextView(this);
TextPaint textPaint = textView.getPaint();
textPaint.setFakeBoldText(true);
55 android 网络权限配置
<uses-permission android:name="android.permission.INTERNET" />
56 android GL设定背景色
gl.glClearColor(0.5f, 0.2f, 0.2f, 1.0f);
gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
57 android 创建GL画布
public class My3DView extends GLSurfaceView {
private GLSurfaceView.Renderer renderer;
public My3DView(Context context) {
super(context);
renderer = new My3DRender();
setRenderer(renderer);
}}
58 android 创建复选框
CheckBox checkBox = new CheckBox(this);
59 android 复选框监听选择/取消事件
checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
Log.i("QSR","TEST");
}
});
60 android 创建菜单
//重写下面这个函数
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
menu.add(0, 1, 1, "test1");
menu.add(0, 2, 2, "test2");
menu.add(0, 3, 3, "test3");
menu.add(0, 4, 4, "test4");
return true;
61 android 处理菜单选择事件
public boolean onOptionsItemSelected(MenuItem item)
{
int id = item.getItemId();
switch (id) {
case 1:
Log.i("QSR","1");
break;
case 2:
Log.i("QSR","2");
break;
case 3:
Log.i("QSR","3");
break;
case 4:
Log.i("QSR","4");
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
}
62 android 允许程序访问GPS(XML配置)
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
63 android 允许程序访问GSM网络信息(XML配置)
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
64 android 允许程序访问WIFI网络信息(XML配置)
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
65 android 允许程序更新电池状态(XML配置)
<uses-permission android:name="android.permission.BATTERY_STATS"/>
66 android 允许程序写短信(XML配置)
<uses-permission android:name="android.permission.WRITE_SMS"/>
67 android 允许程序设置壁纸(XML配置)
<uses-permission android:name="android.permission.SET_WALLPAPER"/>
68 android 允许程序使用蓝牙(XML配置)
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
69 android 允许程序打电话(XML配置)
<uses-permission android:name="android.permission.CALL_PHONE"/>
70 android 允许程序使用照相设备(XML配置)
<uses-permission android:name="android.permission.CAMERA"/>
71 android 允许程序改变网络状态(XML配置)
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
72 android 允许程序改变WIFI状态(XML配置)
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
73 android 允许程序删除缓存文件(XML配置)
<uses-permission android:name="android.permission.DELETE_CACHE_FILES"/>
74 android 允许程序删除包(XML配置)
<uses-permission android:name="android.permission.DELETE_PACKAGES"/>
75 android 允许程序禁用键盘锁(XML配置)
<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>
76 android 允许程序获取任务信息(XML配置)
<uses-permission android:name="android.permission.GET_TASKS"/>
77 android 允许程序截获鼠标或键盘等事件(XML配置)
<uses-permission android:name="android.permission.INJECT_EVENTS"/>
78 android 允许程序使用socket(XML配置)
<uses-permission android:name="android.permission.INTERNET"/>
79 android 允许程序读取日历(XML配置)
<uses-permission android:name="android.permission.READ_CALENDAR"/>
80 android 允许程序读取系统日志(XML配置)
<uses-permission android:name="android.permission.READ_LOGS"/>
81 android 允许程序读取所有者数据(XML配置)
<uses-permission android:name="android.permission.READ_OWNER_DATA"/>
82 android 允许程序读取短信(XML配置)
<uses-permission android:name="android.permission.READ_SMS"/>
83 android 允许程序重启设备(XML配置)
<uses-permission android:name="android.permission.REBOOT"/>
84 android 允许程序录制音频(XML配置)
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
85 android 允许程序发送短信(XML配置)
<uses-permission android:name="android.permission.SEND_SMS"/>
86 android 允许程序将自己置为最前(XML配置)
<uses-permission android:name="android.permission.SET_PROCESS_FOREGROUND"/>
87 android 创建图像图片Bitmap
Resources res = getResources();
Bitmap bitmap = BitmapFactory.decodeResource(res, R.drawable.hh);
88 android 取得远程图片
HttpURLConnection conn = (HttpURLConnection) imageUrl.openConnection();
conn.connect();
InputStream is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
is.close();
89 android 允许程序发送短信(XML配置)
<uses-permission android:name="android.permission.SEND_SMS"/>
90 android 启动和结束服务
startService(new Intent("qsr.test.MyService"));
stopService(new Intent("qsr.test.MyService"));
91 android 创建和配置Service
public class MyService extends Service {
public IBinder onBind(Intent arg0) {return null;}
public void onStart(Intent intent,int startId)
{
super.onStart(intent, startId);
//to do something when start
}
public void onDestroy()
{
super.onDestroy();
//to do something when stop
}
}
//xml配置
<service android:name=".MyService">
<intent-filter>
<action android:name="android.intent.action.TEST_SERVICE" />
<category a76ndroid:name="android.intent.category.default" />
</intent-filter>
</service>
92 android 获得系统感应设备
SensorManager sensorManager =
(SensorManager)getSystemService(Context.SENSOR_SERVICE);
93 android 设置控件布局参数
textView01.setLayoutParams
(
new AbsoluteLayout.LayoutParams(100,60,0,0);//高100，宽60，x=0，y=0；
);
94 android 创建Drawable对象
Resources res = getResources();
Drawable drawable = res.getDrawable(R.drawable.hh);
95 android 访问网页
Uri uri = Uri.parse("http://www.google.com");
Intent intent  = new Intent(Intent.ACTION_VIEW,uri);
startActivity(intent);
96 android 打电话
Uri uri = Uri.parse("tel:00000000");
Intent intent = new Intent(Intent.ACTION_DIAL, uri);
startActivity(intent);
97 android 播放歌曲
Intent intent = new Intent(Intent.ACTION_VIEW);
Uri uri = Uri.parse("file:///sdcard/test.mp3");
intent.setDataAndType(uri, "audio/mp3");
startActivity(intent);
98 android 发送邮件
Intent intent=new Intent(Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_TEXT, "The email text");
intent.setType("text/plain");
startActivity(Intent.createChooser(intent, "Choose Email Client"));
99 android 发短信
Uri uri = Uri.parse("smsto:123456789");
Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
intent.putExtra("sms_body", "The SMS text");
startActivity(intent);
100 android 安装程序
Uri installUri = Uri.fromParts("package", "xxx", null);
Intent intent = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);
startActivity(intent);
101 android 卸载程序
Uri uninstallUri = Uri.fromParts("package", "xxx", null);
Intent intent = new Intent(Intent.ACTION_DELETE, uninstallUri);
startActivity(intent);
102 android 从xml配置获得控件对象
//TestActivity.java
textView = (TextView) findViewById(R.id.TextView01);
//main.xml
< TextView android:text = "TextView01"
android:id = "@+id/TextView01"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_x = "60px"
android:layout_y = "60px"/>
103 android 获得触摸屏压力
public boolean onTouch(View v, MotionEvent event) {
float pressure = event.getPressure();
return false;
}
104 android 给文本加上滚动条
TextView textView = new TextView(this);
textView.setText(string);
ScrollView scrollView = new ScrollView(this);
scrollView.addView(textView);
setContentView(scrollView);
105 android 获得正在运行的所有服务
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
StringBuffer serviceInfo = new StringBuffer();
ActivityManager activityManager = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);
List<RunningServiceInfo> services = activityManager.getRunningServices(256);
Iterator<RunningServiceInfo> iterator = services.iterator();
while (iterator.hasNext()) {
RunningServiceInfo si = (RunningServiceInfo)iterator.next();
serviceInfo.append("pid: ").append(si.pid);
serviceInfo.append("process: ").append(si.process);
}
TextView textView = new TextView(this);
textView.setText(serviceInfo.toString());
ScrollView scrollView = new ScrollView(this);
scrollView.addView(textView);
setContentView(scrollView);
}
106 android 使用ContentResolver获得联系人姓名和号码
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(People.CONTENT_URI, null, null, null, null);
cur.moveToFirst();
do {
int nameColumn = cur.getColumnIndex(People.NAME);
int phoneColumn = cur.getColumnIndex(People.NUMBER);
String name = cur.getString(nameColumn);
String phoneNumber = cur.getString(phoneColumn);
Toast.makeText(this,name,Toast.LENGTH_LONG).show();
Toast.makeText(this,phoneNumber,Toast.LENGTH_LONG).show();
} while (cur.moveToNext());

107 android 创建WebView
WebView webView = new WebView(this);
webView.loadData("<html>"+"<head>test</head>"+"<body>test</body>"+"</html>", "text/html", "utf-8");
108 android 设置地图是否显示卫星和街道
mapView.setSatellite(false);
mapView.setStreetView(true);
109 android 单选框清除
radioGroup.clearCheck();
110 android 给文本增加链接
Linkify.addLinks(mTextView01,Linkify.WEB_URLS);
Linkify.addLinks(mTextView02,Linkify.EMAIL_ADDRESSES);
Linkify.addLinks(mTextView03,Linkify.PHONE_NUMBERS);
111 android 设置手机震动
Vibrator vibrator = (Vibrator)getApplication().getSystemService(Service.VIBRATOR_SERVICE);
vibrator.vibrate( new long[]{1000,1000,1000,1000},-1);//震动一秒，停一秒，再震一秒
112 android 创建下拉框
Spinner spinner = new Spinner(this);
113 android 给spinner添加事件
spinner.setOnItemSelectedListener(
new Spinner.OnItemSelectedListener()
{
   public void onItemSelected(AdapterView<?> parent,View view,int position,long id)
   {
   }
   public void onNothingSelected(AdapterView<?> parent)
   {
   }
});
114 android 图片的显示方式
ImageView imageView = new ImageView(this);
imageView.setScaleType(ImageView.ScaleType.FIT_XY);//适应大小
imageView.setScaleType(ImageView.ScaleType.CENTER);//原始大小，居中显示
115 android 取得缓存目录
File cacheDir = this.getCacheDir();
116 android 取得当前文件目录
File fileDir = this.getFilesDir();
117 android 判断当前wifi是否可用
WifiManager aWiFiManager = (WifiManager)
this.getSystemService(Context.WIFI_SERVICE);
boolean isEnabled = aWiFiManager .isWifiEnabled);
118 android 判断当前wifi是否已经打开
WifiManager aWiFiManager = (WifiManager)
this.getSystemService(Context.WIFI_SERVICE);
if(aWiFiManager.getWifiState()==WifiManager.WIFI_STATE_ENABLED)
Log.i("TEST","it is open");
119 android 判断SIM卡状态
TelephonyManager telephonyManager = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);
if(telephonyManager.getSimState()==telephonyManager.SIM_STATE_READY)
{
   Log.i("TEST","正常");
}
else if(telephonyManager.getSimState()==telephonyManager.SIM_STATE_ABSENT)
{
   Log.i("TEST","无SIM卡");
}
120 android 取得SIM卡商名称
TelephonyManager telephonyManager = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);
String name = telephonyManager.getSimOperatorName();
121 android 为activity增加键盘事件
public boolean onKeyDown(int keyCode, KeyEvent event)
{
switch(keyCode)
{
case KeyEvent.KEYCODE_DPAD_UP:
  Log.i("上",String.valueOf(keyCode));
  break;
case KeyEvent.KEYCODE_DPAD_DOWN:
  Log.i("下",String.valueOf(keyCode));
  break;
case KeyEvent.KEYCODE_DPAD_LEFT:
  Log.i("左",String.valueOf(keyCode));
  break;
case KeyEvent.KEYCODE_DPAD_RIGHT:
  Log.i("右",String.valueOf(keyCode));
  break;
case KeyEvent.KEYCODE_DPAD_CENTER:
  Log.i("中",String.valueOf(keyCode));
  break;
}
  return super.onKeyDown(keyCode, event);
}
122 android 显示正在运行的程序
ActivityManager mActivityManager = (ActivityManager)
getSystemService(ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> mRunningTasks =
mActivityManager.getRunningTasks(100);
for (ActivityManager.RunningTaskInfo task : mRunningTasks)
{
String taskInfo = task.baseActivity.getClassName()
+"(ID=" + amTask.id +")");
}
123 android 切换横竖屏
if(getRequestedOrientation()==
ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)
{
setRequestedOrientation
(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
else if(getRequestedOrientation()==
ActivityInfo.SCREEN_ORIENTATION_PORTRAIT)
{
setRequestedOrientation
(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}
//PORTRAIT竖；LANDSCAPE横
124 android 判断网络类型是否为GPRS
TelephonyManager telephonyManager = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);
if(telephonyManager.getNetworkType()==telephonyManager.NETWORK_TYPE_GPRS)
125 android 发送http请求给网页
String uriAPI = "http://127.0.0.1:8080/test/index.jsp";
HttpPost httpRequest = new HttpPost(uriAPI);
List <NameValuePair> params = new ArrayList <NameValuePair>();
params.add(new BasicNameValuePair("username", "test"));
try
{
httpRequest.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
HttpResponse httpResponse = new DefaultHttpClient().execute(httpRequest);
if(httpResponse.getStatusLine().getStatusCode() == 200)
{
String strResult = EntityUtils.toString(httpResponse.getEntity());
}
}
catch (IOException e)
{
e.printStackTrace();
}
126 android 创建带图片的按钮
ImageButton imageButton = new ImageButton(this);
imageButton.setImageResource(R.drawable.test);
127 android 创建WebView
LinearLayout layout = new LinearLayout(this);
Button button = new Button(this);
layout.addView(button);
layout.removeView(button);
128 android layout设置背景图片
LinearLayout layout = new LinearLayout(this);
layout.setBackgroundResource(R.drawable.hh);//图片放在drawable下了，名字是hh.jpg
129 android 设置铃声
Intent intent = new Intent( RingtoneManager.
ACTION_RINGTONE_PICKER);
130 android 设置网络请求方式/缓存/格式/编码
HttpURLConnection con=(HttpURLConnection)url.openConnection();
con.setUseCaches(false);//不使用缓存
con.setRequestMethod("POST");//请求方式是post
con.setRequestProperty("Content-Type", "text/xml");//格式
con.setRequestProperty("Charset", "UTF-8");//编码
131 android 判断是否为有效的网络url
URLUtil.isNetworkUrl(strPath)
132 android 创建垂直滚动条
ScrollView scrollView = new ScrollView(this);
133 android 创建水平滚动条
HorizontalScrollView horizontalScrollView = new HorizontalScrollView(this);
134 android 创建自动完成文本框
AutoCompleteTextView autoCompleteTextView = new AutoCompleteTextView(this);
135 android 创建地图控件MapView
MapView mapView = new MapView(this);
136 android 设置地图放大系数
mapController = mapView.getController();
mapController.setZoom(12);
137 android layout增加和删除控件
LinearLayout layout = new LinearLayout(this);
Button button = new Button(this);
layout.addView(button);
layout.removeView(button);
138 android 刷新地图显示函数
//继承MapActivity并重写以下方法
public void refreshMapView()
{}
139 android 创建LocationManager
LocationManager locationManager =
(LocationManager)getSystemService(Context.LOCATION_SERVICE);
140 android 设置webView的javascript有效
WebView webView = new WebView(this);
webView.setJavaScriptEnabled(true);
141 android 设置webView的保存密码有效
WebView webView = new WebView(this);
webSettings.setSavePassword(true);
142 android 获得PowerManager
PowerManager powerManager = (PowerManager)getSystemService(Context.POWER_SERVICE);
143 android 相机的预览
parameters.setPreviewSize(640, 480);
//参数的其他设定参考“设置相机图片大小和像素等”
camera.setPreviewDisplay(surfaceHolder);
//这里是个SurfaceHolder对象
camera.startPreview();
camera.stopPreview();
144 android Google Map的移动
GeoPoint point = new GeoPoint(xxx, yyy);
MapController controller = mapView.getController();
controller.animateTo(point);
145 android 设置画笔粗细
Paint paint= new Paint();
paint.setStrokeWidth(1);
146 android 打开相机
Camera.open();
147 android 设置相机图片大小和像素等
Camera.Parameters parameters = camera.getParameters();
//设置相片格式为JPEG
parameters.setPictureFormat(PixelFormat.JPEG);
//设置图片分辨率大小
parameters.setPictureSize(640, 480);
camera.setParameters(parameters);
148 android 将屏幕亮着
PowerManager.WakeLock wakeLock = mPowerManager.newWakeLock
(PowerManager.SCREEN_BRIGHT_WAKE_LOCK, "BackLight");
149 android 暂停和恢复activity
protected void onPause()
{
super.onPause();
}
protected void onResume()
{
super.onResume();
}
150 android 保存和恢复canvas设置
canvas.save();//保存设置
//之间做一些变换，转移，拉伸等操作
canvas.restore();//恢复设置
151 android 地图搜索
Intent search = new Intent(Intent.ACTION_WEB_SEARCH);
search.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
search.putExtra(SearchManager.QUERY, "new york");
startActivity(search);
152 android 设置播放器音量
mediaPlayer.setVolume(10, 10);
153 android 播放器跳转到具体位置
mediaPlayer.seekTo(0);//0的单位是毫秒
154 android 获得手机号码和手机串号(IMEI)
TelephonyManager telephonyManager = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
String imei = telephonyManager.getDeviceId();
String tel = telephonyManager.getLine1Number();
155 android 闹钟设置代码
//接受闹铃并显示提示
class AlarmReceiver extends BroadcastReceiver {
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "时间到", Toast.LENGTH_LONG).show();
}
}
// 实例化自定义的 BroadcastReceiver
AlarmReceiver receiver = new AlarmReceiver();
IntentFilter filter = new IntentFilter();
filter.addAction("android.intent.action.BOOT_COMPLETED");
// 以编程方式注册  BroadcastReceiver 。xml配置方式见下
// 一般在 OnStart 时注册，在 OnStop 时取消注册
registerReceiver(receiver, filter);
Intent intent = new Intent(this, AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
//一次闹铃
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() +1000, pendingIntent);
//周期闹铃
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 1000, 10000, pendingIntent);
//xml配置
<receiver android:name=".AlarmReceiver">
         <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
         </intent-filter>
</receiver>
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
156 android 接收系统启动完毕的broadcast的权限
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
157 android 多媒体录制
MediaRecorder recorder = new MediaRecorder();
recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); //视频
recorder.setAudioSource(MediaRecorder.AudioSource.MIC); //音频
recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
recorder.setOutputFile("/sdcard/media/1.3gp");
try {
recorder.prepare();
} catch (IllegalStateException e) {e.printStackTrace();}
catch (IOException e) {e.printStackTrace();}
recorder.start();
158 android 视频播放
VideoView videoView = new VideoView(this);
setContentView(videoView);
videoView.setVideoURI(Uri.parse("/sdcard/1.3gp"));
videoView.requestFocus();
videoView.start();
159 android 绘制文字
canvas.drawText(str, 30, 30, paint);
160 android 判断QWERTY键盘硬件是否滑出
Configuration config = getResources().getConfiguration();
if(config.hardKeyboardHidden == Configuration.KEYBOARDHIDDEN_NO)
{}
else if(config.hardKeyboardHidden == Configuration.KEYBOARDHIDDEN_YES)
{}
161 android 清除手机cookie
CookieSyncManager.createInstance(getApplicationContext());
CookieManager.getInstance().removeAllCookie();
162 android 读写文件
读：
public String ReadSettings(Context context){
   FileInputStream fIn = null;
   InputStreamReader isr = null;
  char[] inputBuffer = new char[255];
  String data = null;
  try{
  fIn = openFileInput("settings.dat");
isr = new InputStreamReader(fIn);
isr.read(inputBuffer);
data = new String(inputBuffer);
Toast.makeText(context, "Settings read",Toast.LENGTH_SHORT).show();
}
catch (Exception e) {
e.printStackTrace();
   Toast.makeText(context, "Settings not read",Toast.LENGTH_SHORT).show();
   }
finally {
  try {
   isr.close();
fIn.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return data;
}
写：
public void WriteSettings(Context context, String data){
FileOutputStream fOut = null;
OutputStreamWriter osw = null;
try{
fOut = openFileOutput("settings.dat",MODE_PRIVATE);
  osw = new OutputStreamWriter(fOut);
  osw.write(data);
osw.flush();
Toast.makeText(context, "Settings saved",Toast.LENGTH_SHORT).show();
}
catch (Exception e) {
e.printStackTrace();
Toast.makeText(context, "Settings not saved",Toast.LENGTH_SHORT).show();
}
  finally {
try {
   osw.close();
      fOut.close();
} catch (IOException e) {
   e.printStackTrace();
  }
}
  }
163 android 判断不可卸载的程序
PackageManager mPm = getPackageManager();
List<ApplicationInfo> installedAppList =
mPm.getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES);
**
for (ApplicationInfo appInfo :installedAppList) {
boolean flag = false;
if ((appInfo.flags &ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0){
// Updated system app
flag = true;
} else if ((appInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
// Non-system app
flag = true;
}
if (flag) {
appList.add(appInfo);
}
}
164 android 判断是否飞行模式
boolean isEnabled = Settings.System.getInt(
context.getContentResolver(),
Settings.System.AIRPLANE_MODE_ON, 0) == 1;

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