Android自定义Dialog

---

• 效果图

test_net.png

• AndroidManifest.xml（记得加上权限）

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

• 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>

• 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>

• 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;
    }
}

• Test.java

NetView .getInstance(context).showNetDialog();//显示dialog
NetView .getInstance(context).exitDilog();//关闭dialog  

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