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public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) { // 监控/拦截/屏蔽返回键
//返回键你要干啥,如果不写super.onKeyDown(keyCode, event);的话,相当于拦截返回键,没有真正的返回效果。
} else if (keyCode == KeyEvent.KEYCODE_MENU) {
return super.onKeyDown(keyCode, event);
//do something
} else if (keyCode == KeyEvent.KEYCODE_HOME) {
return super.onKeyDown(keyCode, event);
}else{
return super.onKeyDown(keyCode, event);
}
}少侠,我就帮你到这了
关键就是这段代码放在哪里,之前我重写view 然后放了这些类似的代码,但是报错,说是视图对象转换出错,因为我的视图是通过LayoutInflate的inflate( )方法生成的。
class EnterPassView extends View { public EnterPassView(Context context) {
super(context);
}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if(event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
Message message = viewHandler.obtainMessage(0);
viewHandler.sendMessage(message);
return super.dispatchKeyEvent(event);
} else if(event.getKeyCode() == KeyEvent.KEYCODE_HOME) {
Message message = viewHandler.obtainMessage(0);
viewHandler.sendMessage(message);
return super.dispatchKeyEvent(event);
} else if(event.getKeyCode() == KeyEvent.KEYCODE_MENU) {
Message message = viewHandler.obtainMessage(0);
viewHandler.sendMessage(message);
return super.dispatchKeyEvent(event);
}
return super.dispatchKeyEvent(event);
}private void showGestureLockView() {
params = new WindowManager.LayoutParams(
WindowManager.LayoutParams.MATCH_PARENT,
WindowManager.LayoutParams.MATCH_PARENT,
WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
WindowManager.LayoutParams.FLAG_FULLSCREEN |
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
PixelFormat.RGBA_8888);
params.gravity = (Gravity.CENTER);
LayoutInflater layoutInflater =
(LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
enterPassView = layoutInflater.inflate(R.layout.activity_enterpass, null);
gesturePassView = (GesturePassView) enterPassView.findViewById(R.id.enterpass_view_gpv);
gesturePassView.setSavedPass(savePass);
gesturePassView.setScene(0);
gesturePassView.setOnGestureCompleteListener(new OnGestureCompleteListener() {
@Override
public void onGestureComplete(int result, String enterPassword) {
if(result == 0) {
iv_icon.setAnimation(animation);
tv_text.setText(R.string.enterpass_lesspass);
} else if(result == 1){
Message message = viewHandler.obtainMessage(0);
viewHandler.sendMessage(message);
Log.e("sendMessage", "pass is true want to remove view");
} else if(result == -1){
iv_icon.setAnimation(animation);
tv_text.setText(R.string.enterpass_wrongpass);
}
}
});
if(windowsManager == null) {
windowsManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
}
if(windowsManager != null && enterPassView != null) {
Message message = viewHandler.obtainMessage(1);
viewHandler.sendMessage(message);
Log.e("sendMessage", "want to addView");
}
}
Handler viewHandler = new Handler() {
@Override
public void handleMessage(Message message) {
int flag = message.what;
if(flag == 1) {
windowsManager.addView(enterPassView, params);
Log.e("sendMessage", "addView");
} else if(flag == 0) {
windowsManager.removeView(enterPassView);
enterPassView = null;
Log.e("sendMessage", "removeView");
}
}
};
MainActivity.java
public class MainActivity extends Activity { @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = new Intent(MainActivity.this, MyService.class);
startService(intent);
}}MyService.java
public class MyService extends Service {
Thread thread;
WindowManager windowsManager = null;
WindowManager.LayoutParams params;
View view; @Override
public IBinder onBind(Intent intent) {
return null;
} @Override
public void onCreate() {
super.onCreate();
new Handler().postDelayed(new Runnable() { @Override
public void run() {
showView();
}
}, 5000);
} @Override
public void onDestroy() {
super.onDestroy();
}
private void showView() {
params = new WindowManager.LayoutParams(
WindowManager.LayoutParams.MATCH_PARENT,
WindowManager.LayoutParams.MATCH_PARENT,
WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
WindowManager.LayoutParams.FLAG_FULLSCREEN |
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
PixelFormat.RGBA_8888);
params.gravity = (Gravity.CENTER);
LayoutInflater layoutInflater =
(LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = layoutInflater.inflate(R.layout.view_service, null);
if(windowsManager == null) {
windowsManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
}
if(windowsManager != null && view != null) {
Message message = addViewHandler.obtainMessage(1);
addViewHandler.sendMessage(message);
}
}
Handler addViewHandler = new Handler() {
@Override
public void handleMessage(Message message) {
int flag = message.what;
if(flag == 1) {
windowsManager.addView(view, params);
} else if(flag == 0) {
windowsManager.removeView(view);
}
}
};}view_service.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#32CD32"
android:gravity="center"
android:orientation="vertical" >
<ImageView
android:id="@+id/iv_icon"
android:layout_width="70dp"
android:layout_height="70dp"
android:src="@drawable/ic_launcher"
/>
<TextView
android:id="@+id/tv_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="hello android"
android:textColor="#ffffff"
android:textSize="16sp"
/>
</LinearLayout>
以上就是主要Demo代码,启动应用后,主Activity启动Service,在5秒延迟之后addView( ),此时我想要实现的功能是通过按返回键或者home键能够removeView( ).