Android 5.0 Intercept HomeKey

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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();    }}

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