【Android M】平台方实现三指左右滑动任何应用界面截屏

frameworks/base/core/java/com/android/internal/policy/MultiGestureSupport/MultiGestureMonitor.java　//新增的类

frameworks/base/core/java/com/android/internal/policy/PhoneWindow.java

原文地址：http://blog.csdn.net/yelangjueqi/article/details/56275913

源码

１　MultiGestureMonitor.java　//多指检测类

package com.example.android;import android.content.Context;
import android.content.Intent;
import android.provider.Settings;
import android.util.Log;
import android.view.MotionEvent;
import android.view.VelocityTracker;/*** Multi Finger Screenshot Gesture Monitor** @hide*/
public class MultiGestureMonitor {private static final String TAG = "FingerScreenShotGesture/" + MultiGestureMonitor.class.getSimpleName();private final String TAG_EVENT = TAG + "/EventPoint";private boolean DBG = false;private boolean isSupportHorizontalSlide = true;public static final String ACTION_MULTI_FINGER_SCREEN_SHOT = "android.intent.action.MULTI_FINGER_SCREEN_SHOT";public static final String MULTI_FINGER_SCREEN_SHOT_ENABLED = "multi_finger_screen_shot_enabled";private final int SUPPORT_FINGER_COUNTS = 3;private final int HORIZONTAL_SLIDE_OFFSET_DISTANCEY = 300;private final int HORIZONTAL_SLIDE_OFFSET_DISTANCEX = 160;private final int VERTICAL_SLIDE_OFFSET_DISTANCEY = 160;private final int VERTICAL_SLIDE_OFFSET_DISTANCEX = 80;private final float BASEVELOCOTY = 45;private int mode;private float mOldx0;private float mOldy0;private float mOldx1;private float mOldy1;private float mOldx2;private float mOldy2;private float mVelocityX0;private float mVelocityY0;private Context mContext;private VelocityTracker mVelocityTracker;private boolean mFingerScreenShotEnabled = false;private boolean getFingerEnable() {int mFingerMode = Settings.System.getInt(mContext.getContentResolver(), MULTI_FINGER_SCREEN_SHOT_ENABLED, 0);if (mFingerMode == 1) {return true;} else {return false;}}// private static MultiGestureMonitor sInstance;//// public static MultiGestureMonitor getInstance(Context context) {// if (sInstance == null) {// sInstance = new MultiGestureMonitor(context);// }// return sInstance;// }public MultiGestureMonitor(Context context) {mContext = context;}public boolean onTouchEvent(MotionEvent event) {boolean handled = false;int action = event.getAction();switch (action & MotionEvent.ACTION_MASK) {case MotionEvent.ACTION_DOWN:if (mVelocityTracker == null) {mVelocityTracker = VelocityTracker.obtain();} else {mVelocityTracker.clear();}mVelocityTracker.addMovement(event);mode = 1;break;case MotionEvent.ACTION_MOVE:if (mVelocityTracker != null) {mVelocityTracker.addMovement(event);mVelocityTracker.computeCurrentVelocity(1000);mVelocityX0 = mVelocityTracker.getXVelocity();mVelocityY0 = mVelocityTracker.getYVelocity();}break;case MotionEvent.ACTION_POINTER_DOWN:mode += 1;if (mode == SUPPORT_FINGER_COUNTS) {mFingerScreenShotEnabled = getFingerEnable();try {mOldx0 = event.getX(event.getPointerId(0));mOldy0 = event.getY(event.getPointerId(0));mOldx1 = event.getX(event.getPointerId(1));mOldy1 = event.getY(event.getPointerId(1));mOldx2 = event.getX(event.getPointerId(2));mOldy2 = event.getY(event.getPointerId(2));if (DBG) {Log.v(TAG_EVENT, "oldx0:" + mOldx0 + ",oldy0:" + mOldy0 + ",oldx1:" + mOldx1 + ",oldy1:"+ mOldy1 + ",mOldx2=" + mOldx2 + ",mOldy2=" + mOldy2);}} catch (IllegalArgumentException e) {e.printStackTrace();}}break;case MotionEvent.ACTION_POINTER_UP:if (mode == SUPPORT_FINGER_COUNTS) {if (!mFingerScreenShotEnabled) {return false;}try {float newx0 = event.getX(event.getPointerId(0));float newy0 = event.getY(event.getPointerId(0));float newx1 = event.getX(event.getPointerId(1));float newy1 = event.getY(event.getPointerId(1));float newx2 = event.getX(event.getPointerId(2));float newy2 = event.getY(event.getPointerId(2));if (DBG) {Log.d(TAG_EVENT,"newx0:" + (Math.abs(newx0 - mOldx0) > HORIZONTAL_SLIDE_OFFSET_DISTANCEX) + ",newy0:"+ (Math.abs(newy0 - mOldy0) < HORIZONTAL_SLIDE_OFFSET_DISTANCEY) + ",newx1:"+ (Math.abs(mVelocityX0) > BASEVELOCOTY) + ",newy1:"+ (Math.abs(newy0 - mOldy0) > VERTICAL_SLIDE_OFFSET_DISTANCEY) + ",newx2="+ (Math.abs(newx0 - mOldx0) < VERTICAL_SLIDE_OFFSET_DISTANCEX) + ",newy2="+ (Math.abs(mVelocityY0) > BASEVELOCOTY));Log.d(TAG_EVENT, "mVelocityX0=" + mVelocityX0 + ",mVelocityY0=" + mVelocityY0);}if (isSupportHorizontalSlide) {if (Math.abs(newx0 - mOldx0) > HORIZONTAL_SLIDE_OFFSET_DISTANCEX&& Math.abs(newy0 - mOldy0) < HORIZONTAL_SLIDE_OFFSET_DISTANCEY&& Math.abs(mVelocityX0) > BASEVELOCOTY) {notifyScreenshotGestureCompleted();}} else {if (Math.abs(newy0 - mOldy0) > VERTICAL_SLIDE_OFFSET_DISTANCEY&& Math.abs(newx0 - mOldx0) < VERTICAL_SLIDE_OFFSET_DISTANCEX&& Math.abs(mVelocityY0) > BASEVELOCOTY) {notifyScreenshotGestureCompleted();}}} catch (IllegalArgumentException e) {e.printStackTrace();}}mode -= 1;break;case MotionEvent.ACTION_UP:case MotionEvent.ACTION_CANCEL:Log.v(TAG, "ACTION_UP or ACTION_CANCEL");mode = 0;if (mVelocityTracker != null) {mVelocityTracker.recycle();mVelocityTracker = null;}resetToInitValue();break;}Log.v(TAG, TAG + String.valueOf(handled));return handled;}private void notifyScreenshotGestureCompleted() {if (mContext != null) {Intent intent = new Intent();intent.setAction(ACTION_MULTI_FINGER_SCREEN_SHOT);mContext.sendBroadcast(intent);Log.d(TAG, "sendBroadcast:" + ACTION_MULTI_FINGER_SCREEN_SHOT);}}private void resetToInitValue() {mOldx0 = 0;mOldy0 = 0;mOldx1 = 0;mOldy1 = 0;mOldx2 = 0;mOldy2 = 0;}
}

说明：

该类为多指手势检测的关键类，具体支持几个手指截屏，由常亮"SUPPORT_FINGER_COUNTS"控制，此处为３，即三指截屏

Ａ，MULTI_FINGER_SCREEN_SHOT_ENABLED = "multi_finger_screen_shot_enabled"　为三指截屏的控制开关

Ｂ，满足三指滑动手势后调用notifyScreenshotGestureCompleted()方法发送Action到PhoneWindowManager类，调用takeScreenshot()进行截屏

２　PhoneWindow.java

PhoneWindow类修改如下，见高亮部分代码：

public PhoneWindow(Context context) {
super(context);
mLayoutInflater = LayoutInflater.from(context);

initFingerScreenshot();
}

......

private final String TAG_FINGER = "/FingerScreenShotGesture";
    private boolean DBG = true;
    private MultiGestureMonitor mMultiGestureMonitor;
    private int mFingerScreenShotEnabled = 0;
    private final String MULTI_FINGER_SCREEN_SHOT_ENABLED = MultiGestureMonitor.MULTI_FINGER_SCREEN_SHOT_ENABLED;

private void initFingerScreenshot() {
mMultiGestureMonitor = new MultiGestureMonitor(getContext());
}

private boolean isSupportFingerScreenshot() {
        return Settings.System.getInt(getContext().getContentResolver(),
                MULTI_FINGER_SCREEN_SHOT_ENABLED, 0) == 1;
    }

......

@Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
            if (mMultiGestureMonitor != null) {
                boolean ishanded = mMultiGestureMonitor.onTouchEvent(ev);
                if (DBG) Log.v(TAG, "dispatchTouchEvent:" + String.valueOf(ishanded));
                if (ishanded) {
                    return true;
                }
            }

final Callback cb = getCallback();
            return cb != null && !isDestroyed() && mFeatureId < 0 ? cb.dispatchTouchEvent(ev)
                    : super.dispatchTouchEvent(ev);
     }

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