Android 5.0 Intercept HomeKey

Android 5.0 Intercept HomeKey

一、拦截Home键的多种方式介绍
1.1 重写onAttachedToWindow、onKeyDown
1.2 重写onSaveInstanceState
1.3 重写onUserLeaveHint
1.4 监听广播Intent.ACTION_CLOSE_SYSTEM_DIALOGS

Android 4.4 之前版本，前三种方式都是可以拦截到的，第四种未确认。4.4之后的系统前三种已经失效，因为在系统Frameworks层已经做了拦截，Application层只能用第四种方式监听广播。

二、封装监听广播接口

public class KeypadIntercept {

private static final String TAG = "KeypadIntercept";

private Context mContext;
private IntentFilter mFilter;

private OnKeypadListener mListener;
private HomeKeyRecevier mRecevier;

// 广播携带String类型参数
final String SYSTEM_DIALOG_REASON_KEY = "reason";
// 切换应用程序键
final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";
// Home键
final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";

// 申明按键事件监听接口
public interface OnKeypadListener {
void onHomeKeypadPressed();

void onRecentKeypadPressed();

void onKeypadError();
}

public KeypadIntercept(Context context) {
mContext = context;
mRecevier = new HomeKeyRecevier();
// 实例化的时候给Intent添加广播
mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
}

public void setOnKeypadListener(OnKeypadListener listener) {
mListener = listener;
}

public void startListener() {
if (mRecevier != null) {
// 动态注册广播
mContext.registerReceiver(mRecevier, mFilter);
}
}

public void stopListener() {
if (mRecevier != null) {
// 注销广播
mContext.unregisterReceiver(mRecevier);
}
}

class HomeKeyRecevier extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
String reasonKey = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);
if (reasonKey != null) {
if (mListener != null) {
Log.i(TAG, "Action= " + action + ", reason= " + reasonKey);
switch (reasonKey) {
case SYSTEM_DIALOG_REASON_HOME_KEY:
mListener.onHomeKeypadPressed();
break;
case SYSTEM_DIALOG_REASON_RECENT_APPS:
mListener.onRecentKeypadPressed();
break;
default:
mListener.onKeypadError();
break;
}
}
}
}
}
}
}

三、Activity使用实例

public class MainActivity extends AppCompatActivity {

KeypadIntercept mKeypadIntercept;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mKeypadIntercept = new KeypadIntercept(MainActivity.this);
mKeypadIntercept.startListener();
mKeypadIntercept.setOnKeypadListener(new KeypadIntercept.OnKeypadListener() {
@Override
public void onHomeKeypadPressed() {
Toast.makeText(MainActivity.this, "onHomeKeypadPressed", Toast.LENGTH_LONG).show();
}

@Override
public void onRecentKeypadPressed() {
Toast.makeText(MainActivity.this, "onRecentKeypadPressed", Toast.LENGTH_LONG).show();
}

@Override
public void onKeypadError() {
Toast.makeText(MainActivity.this, "onKeypadError", Toast.LENGTH_LONG).show();
}
});
}

@Override
protected void onDestroy() {
super.onDestroy();
mKeypadIntercept.stopListener();
}
}