Android(安卓)AlertDialog.Builder进入和退出动画效果设置

Android中，最常的对话框估计就是AlertDialog.Builder了，下面学习一下怎么给它加一些特殊动画效果。

/** * 弹出退出对话框 */private void showExitDialog() {AlertDialog.Builder builder = new Builder(MainActivity.this);builder.setTitle("退出");builder.setMessage("确定要退出吗？");builder.setNegativeButton("取消", null);builder.setNeutralButton("支持", null);builder.setPositiveButton("退出", new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// 停止服务stopService(new Intent(MainActivity.this, MainService.class));// 结束当前窗体MainActivity.this.finish();}});<strong><span style="color:#ff0000;">AlertDialog dialog = builder.create();</span></strong>dialog.show();Window window = dialog.getWindow();window.setWindowAnimations(R.style.<strong><span style="color:#33cc00;">dialog_anim</span></strong>);}

@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {showExitDialog();}return true;}

当用户在按下手机上的返回键是，就会弹出该对话框。该对话框会根据自己所设计的方法弹出来，我设置的是进入时从下往上显示在屏幕中，退出时从屏幕中向下退出。

来看看style文件中的配置：

<style name="dialog_anim" parent="@android:style/Animation">        <item name="android:windowEnterAnimation">@anim/dialog_appear</item>        <item name="android:windowExitAnimation">@anim/dialog_disappear</item>    </style>

其中，anim文件夹下有dialog_appear和dialog_disappear两个资源文件

res/anim/dialog_appear.xml

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" >    <translate        android:duration="500"        android:fromYDelta="100.0%p" />    <alpha        android:duration="500"        android:fromAlpha="0.5"        android:interpolator="@android:anim/accelerate_interpolator"        android:toAlpha="1.0" /></set>

res/anim/dialog_disappear.xml

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" >    <translate        android:duration="500"        android:toYDelta="100.0%p" />    <alpha        android:duration="500"        android:fromAlpha="0.5"        android:interpolator="@android:anim/accelerate_interpolator"        android:toAlpha="1.0" /></set>

如此，在点击返回按键时，即可看到一个对话框从下往上的显示在屏幕上了

另外，给AlertDialog设置View，当用户点击view中的按键时，同时结束该对话框。

/** * 显示搜索对话框 */private void showDialogBySearch() {<span style="color:#ff0000;">final AlertDialog dialog = new AlertDialog.Builder(this).create();dialog.show();</span>Window window = dialog.getWindow();window.setWindowAnimations(R.style.dialog_anim);window.setContentView(<span style="BACKGROUND-COLOR: #33ff33">R.layout.search_dialog</span>);final RadioGroup rg = (RadioGroup) <span style="BACKGROUND-COLOR: #99ff99">window.</span>findViewById(R.id.radioGroup1);final EditText et_word = (EditText) window.findViewById(R.id.et_word);Button btn_search = (Button) window.findViewById(R.id.btn_search);btn_search.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {search(rg, et_word);<span style="color:#ff0000;">dialog.dismiss();</span>}public void search(final RadioGroup rg, final EditText et_word) {List<Poem> list = null;String word = et_word.getText().toString().trim();int rbId = rg.getCheckedRadioButtonId();switch (rbId) {case R.id.radio0: // 标题list = poemDAO.getGeneral("title", word);break;case R.id.radio1: // 诗歌list = poemDAO.getGeneral("content", word);break;case R.id.radio2: // 注解list = poemDAO.getGeneral("desc", word);break;}MyAdapter adapter = new MyAdapter(MainActivity.this, list);lv_catelog.setAdapter(adapter);}});}

res/layout/search_dialog.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:gravity="center"    android:background="#fff"    android:orientation="vertical" >    <RadioGroup        android:id="@id/radioGroup1"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_margin="12.0dip"        android:gravity="center"        android:orientation="horizontal" >        <RadioButton            android:id="@id/radio0"            android:layout_width="0.0dip"            android:layout_height="wrap_content"            android:layout_weight="1.0"            android:checked="true"            android:text="@string/str20149" />        <RadioButton            android:id="@id/radio1"            android:layout_width="0.0dip"            android:layout_height="wrap_content"            android:layout_weight="1.0"            android:text="@string/str20150" />        <RadioButton            android:id="@id/radio2"            android:layout_width="0.0dip"            android:layout_height="wrap_content"            android:layout_weight="1.0"            android:text="@string/str20151" />    </RadioGroup>    <EditText        android:id="@id/et_word"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_margin="12.0dip"        android:ems="10"        android:hint="请输入查询关键字"        android:singleLine="true" >        <requestFocus />    </EditText>    <Button        android:id="@id/btn_search"        android:layout_width="140.0dip"        android:layout_height="wrap_content"        android:layout_marginBottom="12.0dip"        android:text="@string/str20152" /></LinearLayout>

当点击自定义View内面的查询按钮后，对话框就会退出页面了。。。。。。

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