Android - 什么意思做主页按钮问题?

时间:2011-04-02 01:27:22

标签: android

我想确切知道设备主页按钮的操作是什么?即当您点击主页按钮时会发出什么意图,意图类别和行动?这会带回到空白的主屏幕。我想知道在单击我自己的自定义按钮时实现此操作所涉及的内容。谢谢(PS我知道它不是标准的,但我的设备也不是。)

4 个答案:

答案 0 :(得分:13)

如果要显示主屏幕,可以通过以下方式执行:

Intent startMain = new Intent(Intent.ACTION_MAIN);
startMain.addCategory(Intent.CATEGORY_HOME);
startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(startMain);

更新:查看此示例应用:http://developer.android.com/resources/samples/Home/index.html

答案 1 :(得分:0)

这是xml中的意图,如果您正在寻找它:

    <activity
        android:name=".MainActivity"
        android:launchMode="singleTask"
        android:excludeFromRecents="true">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <!-- The following two intent-filters are the key to set homescreen -->
            <category android:name="android.intent.category.HOME" />
            <category android:name="android.intent.category.DEFAULT" />

        </intent-filter>
    </activity>

答案 2 :(得分:0)

请参阅here

此外,您应该能够看到使用logcat调试选项从adb单击Home按钮后会发生什么;

adb logcat *:W

答案 3 :(得分:-1)

您可以参考代码:

Button btnHome;
btnHome = (Button) findViewById(R.id.Home);
btnHome.setOnClickListener(new OnClickListener() {  

    @Override
    public void onClick(View v) {
        // sendKey(KeyEvent.KEYCODE_HOME);
        myHandler.sendEmptyMessage(Home);
    }
});

class myRunnable implements Runnable {

    public myRunnable(int key) {
        this.keycode = key;
    }

    int keycode;

    @Override
    public void run() {
        sendKey(keycode);
    }

    public void sendKey(int keyCode) {
        System.out.println("Judy--------------------->sendkey " + keyCode);
        long now = SystemClock.uptimeMillis();
        long n = System.currentTimeMillis();
        try {
            KeyEvent down = new KeyEvent(now, now, KeyEvent.ACTION_DOWN,
                    keyCode, 0);
            KeyEvent up = new KeyEvent(now, now, KeyEvent.ACTION_UP,keyCode, 0);
            IWindowManager wm = IWindowManager.Stub.asInterface(ServiceManager
                    .getService("window"));
            wm.injectKeyEvent(down, false);
            wm.injectKeyEvent(up, false);
        } catch (RemoteException e) {}
    }
}