android.widget.ImageView#setOnFocusChangeListener ( )源码实例Demo

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mMediaProjectionManager = (MediaProjectionManager)
                                    getSystemService(Context.MEDIA_PROJECTION_SERVICE);

    ImageView iv = findViewById(R.id.power_toggle);
    iv.setOnClickListener(this);
    iv.setOnFocusChangeListener(this);
    iv.setFocusable(true);
    iv.requestFocus();

    setImageViews(mRecorderRunning, false);

    LocalBroadcastManager.getInstance(this).registerReceiver(
            mMessageReceiver, new IntentFilter(HyperionScreenService.BROADCAST_FILTER));
    checkForInstance();
}
 

private void initActivity() {
    // assume the recorder is not running until we are notified otherwise
    mRecorderRunning = false;

    setContentView(R.layout.activity_main);
    AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
    mMediaProjectionManager = (MediaProjectionManager)
                                    getSystemService(Context.MEDIA_PROJECTION_SERVICE);

    ImageView iv = findViewById(R.id.power_toggle);
    iv.setOnClickListener(this);
    iv.setOnFocusChangeListener(this);
    iv.setFocusable(true);
    iv.requestFocus();

    ImageButton ib = findViewById(R.id.settingsButton);
    ib.setOnClickListener(this);
    ib.setOnFocusChangeListener(this);
    ib.setFocusable(true);

    setImageViews(mRecorderRunning, false);

    LocalBroadcastManager.getInstance(this).registerReceiver(
            mMessageReceiver, new IntentFilter(BROADCAST_FILTER));

    // request an update on the running status
    checkForInstance();
}
 

@Override
protected void onFinishInflate() {
    super.onFinishInflate();
    mAllAppsHandle = (ImageView) findViewById(R.id.all_apps_handle);
    mAllAppsHandle.setImageDrawable(getCaretDrawable());
    mAllAppsHandle.setOnTouchListener(mLauncher.getHapticFeedbackTouchListener());
    mAllAppsHandle.setOnClickListener(mLauncher);
    mAllAppsHandle.setOnLongClickListener(mLauncher);
    mAllAppsHandle.setOnFocusChangeListener(mLauncher.mFocusHandler);
    mLauncher.setAllAppsButton(mAllAppsHandle);
}
 

/**
 * Set up the dashboard of buttons to launch the various services of the
 * app. This covers things like touch/focus listeners, authentication,
 * intent to launch, etc.
 */
private void setupDashBoardButtons() {
    scheduleCheck = (ImageView) findViewById(R.id.scheduleCheck);
    balanceCheck = (ImageView) findViewById(R.id.balanceCheck);
    dataCheck = (ImageView) findViewById(R.id.dataCheck);

    ProgressBar scheduleProgress = (ProgressBar) findViewById(R.id.scheduleProgress);
    ProgressBar balanceProgress = (ProgressBar) findViewById(R.id.balanceProgress);
    ProgressBar dataProgress = (ProgressBar) findViewById(R.id.dataProgress);

    final Intent schedule = new Intent(this, ScheduleActivity.class);
    final Intent balance = new Intent(this, BalanceActivity.class);
    final Intent map = new Intent(this, CampusMapActivity.class);
    final Intent data = new Intent(this, DataUsageActivity.class);
    final Intent menu = new Intent(this, MenuActivity.class);



    DashboardButtonData buttonData[] = new DashboardButtonData[6];
    buttonData[0] = new DashboardButtonData(schedule, R.id.schedule_button, authCookie,
            scheduleCheck, scheduleProgress, !loginFailed);
    buttonData[1] = new DashboardButtonData(balance, R.id.balance_button, authCookie,
            balanceCheck, balanceProgress, !loginFailed);
    buttonData[2] = new DashboardButtonData(data, R.id.data_button, authCookie,
            dataCheck, dataProgress, !loginFailed);
    buttonData[3] = new DashboardButtonData(map, R.id.map_button);
    buttonData[4] = new DashboardButtonData(menu, R.id.menu_button);

    featureButtons = new ImageView[5];
    for (int i = 0; i < 5; i++) {
        ImageView ib = (ImageView) findViewById(buttonData[i].imageButtonId);
        ib.setOnTouchListener(new ImageButtonTouchListener(
                (TransitionDrawable) ib.getDrawable()));
        ib.setOnFocusChangeListener(new ImageButtonFocusListener());
        ib.setTag(buttonData[i]);
        if (buttonData[i].enabled) {
            enableFeature(ib);
        } else {
            disableFeature(ib);
        }
        featureButtons[i] = ib;
    }
}