SnackBar 简单分析

   <h3>介绍</h3>    <p>Snackbars provide lightweight feedback about an operation. They show a brief message at the</p>    <p>bottom of the screen on mobile and lower left on larger devices. Snackbars appear above all other</p>    <p>elements on screen and only one can be displayed at a time.</p>    <p>They automatically disappear after a timeout or after user interaction elsewhere on the screen,</p>    <p>particularly after interactions that summon a new surface or activity. Snackbars can be swiped</p>    <p>off screen.</p>    <p>Snackbars can contain an action which is set via</p>    <p>{@link #setAction(CharSequence, android.view.View.OnClickListener)}.</p>    <p>To be notified when a snackbar has been shown or dismissed, you can provide a {@link Callback} via {@link #setCallback(Callback)}.</p>    <p>翻译：</p>    <p>Snackbar为用户的一个操作提供轻量级的反馈，他会在手机屏幕的底部或者是大设备的左下方显示一个简洁的消息。Snackbar出现在屏幕所有元素的上面，显示一小会。</p>    <p>Snackbar显示一会后会自动消失，用户点击其他地方的时候也会消失，尤其，当显示一个新的界面的时候，Snackbar会滑出界面。</p>    <p>Snackbar 可以通过setAction(CharSequence, android.view.View.OnClickListener) 来设置一个点击事件，同时也可以通过setCallback(Callback)来监听snackbar的显示和消失。</p>    <h3>类介绍</h3>    <p>Snackbar中Public属性列表</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/92fcb5bdff562f82743879bba9f00cec.png"></p>    <table>     <thead>      <tr>       <th>方法或接口</th>       <th>意义</th>      </tr>     </thead>     <tbody>      <tr>       <td>Callback</td>       <td>抽象函数用来设置SnackBar显示和消失的回调</td>      </tr>      <tr>       <td>make</td>       <td>创建SnackBar</td>      </tr>      <tr>       <td>setAction</td>       <td>设置ActionView的响应事件</td>      </tr>      <tr>       <td>show</td>       <td>显示SnackBar</td>      </tr>      <tr>       <td>dismiss</td>       <td>收起SnackBar</td>      </tr>      <tr>       <td>setActionTextColor</td>       <td>设置ActionView的字体颜色</td>      </tr>      <tr>       <td>setText</td>       <td>设置TextView的显示内容</td>      </tr>      <tr>       <td>setDuration</td>       <td>设置SnackBar的显示时间</td>      </tr>      <tr>       <td>getDuration</td>       <td>获取SnackBar的显示时间</td>      </tr>      <tr>       <td>getView</td>       <td>获取SnackBar的View视图</td>      </tr>      <tr>       <td>setCallback</td>       <td>设置显示和消失的事件监听</td>      </tr>      <tr>       <td>isShown</td>       <td>是否已经显示</td>      </tr>      <tr>       <td>shownOrQueued</td>       <td>是否已经显示或者在队列中等待显示</td>      </tr>     </tbody>    </table>    <p>整理而言的话，感觉Snackbar就是Toast的一个升级版本，使用的方式和Toast也比较相似。</p>    <p>创建Snackbar之后一定要记得调用show()方法</p>    <h3>具体使用</h3>    <p>–代码内容–</p>    <pre>  <code class="language-java">package mraz.com.snackdemo;    import android.os.Bundle;  import android.support.design.widget.Snackbar;  import android.support.v7.app.AppCompatActivity;  import android.view.View;  import android.widget.Button;  import android.widget.RelativeLayout;  import android.widget.Toast;    public class MainActivity extends AppCompatActivity implements View.OnClickListener {        RelativeLayout rootLayout;        @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);          setContentView(R.layout.activity_main);          rootLayout = (RelativeLayout) findViewById(R.id.root_layout);            Button shortButton = (Button) findViewById(R.id.short_button);          Button longButton = (Button) findViewById(R.id.long_button);            shortButton.setOnClickListener(this);          longButton.setOnClickListener(this);        }        @Override      public void onClick(View view) {          switch (view.getId()) {              case R.id.short_button:                  final Snackbar shortSnackbar = Snackbar.make(rootLayout, " Short SnackBar", Snackbar.LENGTH_SHORT);                  shortSnackbar.setAction("Click", new View.OnClickListener() {                              @Override                              public void onClick(View view) {                                  Toast.makeText(rootLayout.getContext(), "Shoort Snackbar onClick", Toast.LENGTH_SHORT).show();                              }                          }                  );                  shortSnackbar.setActionTextColor(getResources().getColor(R.color.colorPrimaryDark));                  shortSnackbar.show();                    break;                case R.id.long_button:                  Snackbar longSnackbar = Snackbar.make(rootLayout, " Long SnackBar", Snackbar.LENGTH_LONG);                  longSnackbar.setCallback(new SnackCallback());                  longSnackbar.show();                  break;          }      }        class SnackCallback extends Snackbar.Callback {          @Override          public void onDismissed(Snackbar snackbar, int event) {              super.onDismissed(snackbar, event);              Toast.makeText(rootLayout.getContext(), "SnackBar onDismissed", Toast.LENGTH_SHORT).show();          }            @Override          public void onShown(Snackbar snackbar) {              super.onShown(snackbar);              Toast.makeText(rootLayout.getContext(), "SnackBar onShown", Toast.LENGTH_SHORT).show();          }      }  }</code></pre>    <h3>实际效果</h3>    <p style="text-align:center"><img src="https://simg.open-open.com/show/642169a276746672d80da9b485581245.gif"></p>    <p> </p>    <p>来自：http://blog.csdn.net/poorkick/article/details/51814023</p>    <p> </p>