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效果图
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AndroidManifest.xml(记得加上权限)
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
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style.xml
<style name="NetDialogBackground" parent="android:style/Theme.Dialog">
<item name="android:windowBackground">@android:color/transparent</item>
<!-- 设置window背景透明,也就是去边框 -->
<item name="android:background">@android:color/transparent</item>
<item name="android:windowFullscreen">true</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowFrame">@null</item>
</style>
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layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00000000"
android:gravity="center"
android:focusable="true"
android:orientation="vertical" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/net_tips"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:id="@+id/net_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/net_no_top_tips"
android:gravity="center"
android:focusable="true"
android:textSize="@dimen/font_21" />
</LinearLayout>
</LinearLayout>
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NetView.java
public class NetView implements OnKeyListener {
private AlertDialog exitDialog;
private boolean isShowing;
private TextView netText;
private static NetView instance = null;
public NetView(Context context) {
exitDialog = new AlertDialog.Builder(context,
R.style.NetDialogBackground).create();
}
public static synchronized NetView getInstance(Context context) {
if (instance == null) {
instance = new NetView(context);
}
return instance;
}
public void showNetDialog() {
exitDialog.getWindow().setType(WindowManager.
LayoutParams.TYPE_SYSTEM_ALERT);
exitDialog.show();
Window window = exitDialog.getWindow();
window.setContentView(R.layout.broken_net_tips_view);
netText = (TextView) exitDialog.findViewById(R.id.net_text);
netText.requestFocus();
netText.setOnKeyListener(this);
}
public boolean isShowing() {
return exitDialog.isShowing();
}
public void exitDilog() {
exitDialog.dismiss();
}
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK &&
event.getAction() == KeyEvent.ACTION_DOWN) {
exitDilog();
}
return false;
}
}
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Test.java
NetView .getInstance(context).showNetDialog();//显示dialog
NetView .getInstance(context).exitDilog();//关闭dialog
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