android中悬浮显示可拖动的工具栏
jopen
10年前
下面的示例是仿QQ音乐之类的歌词栏，可以进行拖动和隐藏，代码如下：
MainActivity：
package com.home.danglingactivity; import android.app.Activity; import android.content.Context; import android.graphics.Rect; import android.os.Bundle; import android.view.Gravity; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.view.WindowManager; import android.view.WindowManager.LayoutParams; import android.widget.Button; public class MainActivity extends Activity implements OnClickListener { private MyTextView tv; private Button btn; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); btn = (Button) findViewById(R.id.main_btn); btn.setOnClickListener(this); } @Override public void onClick(View v) { if (tv != null && tv.isShown()) { hide(); } else { show(); } } /** * 隐藏显示歌词的TextView */ private void hide() { WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE); wm.removeView(tv); btn.setText("显示歌词"); } /** * 显示悬浮的TextView */ private void show() { Rect frame = new Rect(); getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); MyTextView.TOOL_BAR_HIGH = frame.top; WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE); WindowManager.LayoutParams params = MyTextView.params; params.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT | WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY; params.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL | LayoutParams.FLAG_NOT_FOCUSABLE; params.width = WindowManager.LayoutParams.FILL_PARENT; params.height = WindowManager.LayoutParams.WRAP_CONTENT; params.alpha = 80; params.gravity = Gravity.LEFT | Gravity.TOP; // 设置x、y初始值 params.x = 0; params.y = wm.getDefaultDisplay().getHeight(); tv = new MyTextView(MainActivity.this); wm.addView(tv, params); btn.setText("隐藏歌词"); } @Override protected void onDestroy() { WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE); if (tv != null && tv.isShown()) { wm.removeView(tv); } super.onDestroy(); } } MyTextView：
package com.home.danglingactivity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.LinearGradient; import android.graphics.Paint; import android.graphics.Shader; import android.graphics.Shader.TileMode; import android.graphics.Typeface; import android.view.MotionEvent; import android.view.WindowManager; import android.widget.TextView; public class MyTextView extends TextView { private final String TAG = MyTextView.class.getSimpleName(); public static int TOOL_BAR_HIGH = 0; public static WindowManager.LayoutParams params = new WindowManager.LayoutParams(); private float startX; private float startY; private float x; private float y; private String text = "我是不是你最疼爱的人，你为什么不说话，握住是你冰冷的手动也不动让我好难过";; private float float1 = 0.0f; private float float2 = 0.01f; WindowManager wm = (WindowManager) getContext().getApplicationContext() .getSystemService(Context.WINDOW_SERVICE); public MyTextView(Context context) { super(context); this.setBackgroundColor(Color.argb(100, 140, 160, 150)); } @Override public boolean onTouchEvent(MotionEvent event) { // 触摸点相对于屏幕左上角坐标 x = event.getRawX(); y = event.getRawY() - TOOL_BAR_HIGH; switch (event.getAction()) { case MotionEvent.ACTION_DOWN: startX = event.getX(); startY = event.getY(); break; case MotionEvent.ACTION_MOVE: updatePosition(); break; case MotionEvent.ACTION_UP: updatePosition(); startX = startY = 0; break; } return true; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); float1 += 0.001f; float2 += 0.001f; if (float2 > 1.0) { float1 = 0.0f; float2 = 0.01f; } this.setText(""); float len = this.getTextSize() * text.length(); Shader shader = new LinearGradient(0, 0, len, 0, new int[] { Color.YELLOW, Color.RED }, new float[] { float1, float2 }, TileMode.CLAMP); Paint p = new Paint(); p.setShader(shader); p.setTypeface(Typeface.DEFAULT_BOLD); canvas.drawText(text, 0, 10, p); } /** * 更新浮动窗口位置参数 */ private void updatePosition() { // View的当前位置 params.x = (int) (x - startX); params.y = (int) (y - startY); wm.updateViewLayout(this, params); } } 布局xml:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <Button android:id="@+id/main_btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="显示歌词" /> </LinearLayout>
权限：
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> <uses-permission android:name="android.permission.INTERNAL_SYSTEM_WINDOW" />