Android 在导航栏上添加一个截屏按键,点击进行截屏

项目中碰到要求在导航栏上添加截屏按钮的要求,因为正常截屏是在下拉状态栏中,客户截屏操作觉得太麻烦了,所以下面介绍如何实现该功能:

1,首先添加图标到导航栏上,如何添加图标请查询我之前的博客,链接:https://blog.csdn.net/lancelots/article/details/82864210

2,实现点击截屏,修改文件为PhoneStatusBar.java,路径frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java.在该文件中,定义点击监听事件,并实现截屏功能

    private View.OnClickListener mLenovoClickListener = new View.OnClickListener(){
	@Override
        public void onClick(View v) {
	    android.util.Log.d("lei","click capture bitmap");
	    mHandler.post(mScreenshotRunnable);
        }
    };

    final Object mScreenshotLock = new Object();
    ServiceConnection mScreenshotConnection = null;

    final Runnable mScreenshotTimeout = new Runnable() {
        @Override public void run() {
            synchronized (mScreenshotLock) {
                if (mScreenshotConnection != null) {
                    mContext.unbindService(mScreenshotConnection);
                    mScreenshotConnection = null;
                }
            }
        }
    };

   // Assume this is called from the Handler thread.
    private void takeScreenshot() {
        synchronized (mScreenshotLock) {
            if (mScreenshotConnection != null) {
                return;
            }
            ComponentName cn = new ComponentName("com.android.systemui",
                    "com.android.systemui.screenshot.TakeScreenshotService");
            Intent intent = new Intent();
            intent.setComponent(cn);
            ServiceConnection conn = new ServiceConnection() {
                @Override
                public void onServiceConnected(ComponentName name, IBinder service) {
                    synchronized (mScreenshotLock) {
                        if (mScreenshotConnection != this) {
                            return;
                        }
                        Messenger messenger = new Messenger(service);
                        Message msg = Message.obtain(null, 1);
                        final ServiceConnection myConn = this;
                        Handler h = new Handler(mHandler.getLooper()) {
                            @Override
                            public void handleMessage(Message msg) {
                                synchronized (mScreenshotLock) {
                                    if (mScreenshotConnection == myConn) {
                                        mContext.unbindService(mScreenshotConnection);
                                        mScreenshotConnection = null;
                                        mHandler.removeCallbacks(mScreenshotTimeout);
                                    }
                                }
                           }
                        };
                        msg.replyTo = new Messenger(h);
                        msg.arg1 = msg.arg2 = 0;
                        msg.arg1 = 1;
                        msg.arg2 = 1;
                        try {
                            messenger.send(msg);
                        } catch (RemoteException e) {
                        }
                    }
                }
                @Override
                public void onServiceDisconnected(ComponentName name) {}
            };
            if (mContext.bindServiceAsUser(
                    intent, conn, Context.BIND_AUTO_CREATE, UserHandle.CURRENT)) {
                mScreenshotConnection = conn;
                mHandler.postDelayed(mScreenshotTimeout, 10000);
            }
        }
    }

    private final Runnable mScreenshotRunnable = new Runnable() {
        @Override
        public void run() {
            takeScreenshot();
        }
    };



 private void prepareNavigationBarView() {
    ......
    mNavigationBarView.getLenovoMiaButton().setOnClickListener(mLenovoClickListener);    //设置监听
    ......
 }

 如此这般,截屏功能就实现完毕了~