android 右滑返回的示例代码

  <item name="android:windowBackground">@android:color/transparent</item>  <item name="android:windowIsTranslucent">true</item>

@Overridepublic void startActivity(Intent intent) {  super.startActivity(intent);  overridePendingTransition(R.anim.slide_right_in, 0);}@Overridepublic void startActivityForResult(Intent intent, int requestCode) {  super.startActivityForResult(intent, requestCode);  overridePendingTransition(R.anim.slide_right_in, 0);}@Overridepublic void finish() {  super.finish();  overridePendingTransition(0, R.anim.slide_right_out);}//R.anim.slide_right_in<set xmlns:android="http://schemas.android.com/apk/res/android"> <translate   android:duration="300"   android:fromXDelta="100%"   android:toXDelta="0"   android:fromYDelta="0"   android:toYDelta="0"/></set>//R.anim.slide_right_out<set xmlns:android="http://schemas.android.com/apk/res/android"> <translate   android:duration="300"   android:fromXDelta="0"   android:toXDelta="100%"   android:fromYDelta="0"   android:toYDelta="0" /></set>

private float downX = 0;private float downY = 0;private boolean shouldIntercept = false;private boolean hadJudge = false;@Overridepublic boolean dispatchTouchEvent(MotionEvent ev) {  if (shouldIntercept) {    return onTouchEvent(ev);  }  switch (ev.getAction()) {    case MotionEvent.ACTION_DOWN: {      downX = ev.getRawX();      downY = ev.getRawY();      hadJudge = false;      break;    }    case MotionEvent.ACTION_MOVE: {      if (hadJudge) break;      if (ev.getRawX() == downX) break;      if (ev.getRawX() < downX) {        //左滑        hadJudge = true;        break;      }      if (ev.getRawX() - downX >=100){        //超出判断距离        hadJudge = true;        break;      }      if (ev.getRawX() - downX > 50) {        //x轴右滑50~100px        float rate = (ev.getRawX() - downX) / (Math.abs(ev.getRawY() - downY));        if ((downX < 50 && rate > 0.5f) || rate > 2) {          shouldIntercept = true;        }      }      break;    }    case MotionEvent.ACTION_UP: {      downX =0;      downY = 0;      shouldIntercept = false;      hadJudge=false;      break;    }  }  //Activity的默认分发  if (ev.getAction() == MotionEvent.ACTION_DOWN) {    onUserInteraction();  }  if (getWindow().superDispatchTouchEvent(ev)) {    return true;  }  return true;}

private View rootView = null;private float lastX = -1;  private VelocityTracker velocityTracker = null;private int maxFlingVelocity;@Overridepublic boolean onTouchEvent(MotionEvent event) {  if (rootView == null) {    ViewGroup rootGroup = (ViewGroup) (getWindow().getDecorView());    rootView = rootGroup.getChildAt(0);  }  //测量手指抬起时的速度  if (velocityTracker == null) {    velocityTracker = VelocityTracker.obtain();    maxFlingVelocity = ViewConfiguration.get(this).getScaledMaximumFlingVelocity();  }  velocityTracker.addMovement(event);  switch (event.getAction()) {    case MotionEvent.ACTION_DOWN: {      lastX = event.getRawX();      break;    }    case MotionEvent.ACTION_MOVE: {      if (lastX == -1) {        lastX = event.getRawX();        break;      }      //根据手指滑动距离设置根布局偏移距离      rootView.setTranslationX(rootView.getTranslationX() + event.getRawX() - lastX);      if (rootView.getTranslationX() < 0) rootView.setTranslationX(0);      lastX = event.getRawX();      break;    }    case MotionEvent.ACTION_UP: {      //测量手指抬起时的速度      velocityTracker.computeCurrentVelocity(1000, maxFlingVelocity);      float velocityX = velocityTracker.getXVelocity();      if (velocityTracker != null) {        velocityTracker.recycle();        velocityTracker = null;      }      //判断是否返回      if (downX < 50 && velocityX > 1000) {        //手指在左侧边落下，返回        onBack();      } else if (velocityX > 3600) {        //手指快速滑动，返回        onBack();      } else if (rootView.getTranslationX() > ConvertUtil.getWidthInPx() * 0.3) {        //滑动距离超过30%屏幕宽度，返回        onBack();      } else {        //不返回，根布局偏移归零        rootView.animate().translationX(0).setDuration(200).start();      }            lastX = -1;      shouldIntercept = false;      hadJudge=false;      downX = 0;      downY = 0;      break;    }  }  return super.onTouchEvent(event);}

private View shadowView = null;@Overridepublic boolean onTouchEvent(MotionEvent event) {  if (rootView == null) {    //添加阴影        ViewGroup rootGroup = (ViewGroup) (getWindow().getDecorView());    shadowView = new View(this);    rootGroup.addView(shadowView, 0);    ViewGroup.LayoutParams params = shadowView.getLayoutParams();    //阴影宽度    params.width = (int) ((float) ConvertUtil.getWidthInPx() * 0.05f);    params.height = ConvertUtil.getHeightInPx();    shadowView.setLayoutParams(params);    shadowView.setBackgroundResource(R.drawable.shadow_grey_h);    shadowView.setTranslationX(params.width);    rootView = rootGroup.getChildAt(1);  }  ...  switch (event.getAction()) {    ...    case MotionEvent.ACTION_MOVE: {      if (lastX == -1) {        lastX = event.getRawX();        break;      }      //根据手指滑动距离设置根布局偏移距离      rootView.setTranslationX(rootView.getTranslationX() + event.getRawX() - lastX);      if (rootView.getTranslationX() < 0) rootView.setTranslationX(0);      //阴影跟随根布局移动      shadowView.setTranslationX(-shadowView.getWidth()+rootView.getTranslationX());      lastX = event.getRawX();      break;    }    case MotionEvent.ACTION_UP: {      ...      } else {        //不返回，根布局偏移归零        rootView.animate().translationX(0).setDuration(200).start();        //阴影偏移归零        shadowView.animate().translationX(-shadowView.getWidth()).setDuration(200).start();      }      ...    }  }  ...}

private static ArrayList<Activity> Activity_Stack = new ArrayList<>();private BaseSwipeBackActivity lastActivity = null;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  maxFlingVelocity = ViewConfiguration.get(this).getScaledMaximumFlingVelocity();  if (!Activity_Stack.contains(this)) Activity_Stack.add(this);  if (Activity_Stack.size() >= 2) {    Activity last = Activity_Stack.get(Activity_Stack.size() - 2);    if (last instanceof BaseSwipeBackActivity) {      lastActivity = (BaseSwipeBackActivity) last;    }  }}@Overrideprotected void onDestroy() {  super.onDestroy();  Activity_Stack.remove(this);}

private void lowerActivityExitAnim() {  if (rootView == null) return;  //只移动30%  rootView.animate().translationX(-ConvertUtil.getWidthInPx() * 0.3f).setDuration(300).start();}private void lowerActivityEnterAnim(float upperTranslationX) {  if (rootView == null) return;  //保证滑动退出时，上下层时间同步  float r = 1-upperTranslationX/ (float) ConvertUtil.getWidthInPx();  rootView.animate().translationX(0).setDuration((long) (300f * r)).start();}

@Overridepublic void startActivity(Intent intent) {  super.startActivity(intent);  overridePendingTransition(R.anim.slide_right_in, 0);  lowerActivityExitAnim();}@Overridepublic void startActivityForResult(Intent intent, int requestCode) {  super.startActivityForResult(intent, requestCode);  overridePendingTransition(R.anim.slide_right_in, 0);  lowerActivityExitAnim();}@Overridepublic void finish() {  super.finish();  overridePendingTransition(0, R.anim.slide_right_out);  if (lastActivity != null) lastActivity.lowerActivityEnterAnim(rootView.getTranslationX());  Activity_Stack.remove(this);}

@Overridepublic boolean onTouchEvent(MotionEvent event) {  ...  switch (event.getAction()) {    ...    case MotionEvent.ACTION_MOVE: {      ...      //根据手指滑动距离设置根布局偏移距离      rootView.setTranslationX(rootView.getTranslationX() + event.getRawX() - lastX);      if (rootView.getTranslationX() < 0) rootView.setTranslationX(0);      //阴影跟随根布局移动      shadowView.setTranslationX(-shadowView.getWidth() + rootView.getTranslationX());      //下层activity跟随移动      if (lastActivity != null && lastActivity.rootView != null)        //-ConvertUtil.getWidthInPx() * 0.3f初始的偏移        lastActivity.rootView.setTranslationX(-ConvertUtil.getWidthInPx() * 0.3f + rootView.getTranslationX() * 0.3f);      ...    }    case MotionEvent.ACTION_UP: {      ...      } else {        //不返回，根布局偏移归零        rootView.animate().translationX(0).setDuration(200).start();        //阴影偏移归零        shadowView.animate().translationX(-shadowView.getWidth()).setDuration(200).start();        //下层activity偏移复原        if (lastActivity != null)          lastActivity.lowerActivityExitAnim();      }      ...    }  }  return super.onTouchEvent(event);}

public abstract class BaseSwipeBackActivity extends AppCompatActivity {  private static ArrayList<Activity> Activity_Stack = new ArrayList<>();  private BaseSwipeBackActivity lastActivity = null;  private View rootView = null;  private View shadowView = null;  private float downX = 0;  private float downY = 0;  private boolean shouldIntercept = false;  private boolean hadJudge = false;  private float lastX = -1;  private VelocityTracker velocityTracker = null;  private int maxFlingVelocity;  @Override  protected void onCreate(@Nullable Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    maxFlingVelocity = ViewConfiguration.get(this).getScaledMaximumFlingVelocity();    if (!Activity_Stack.contains(this)) Activity_Stack.add(this);    if (Activity_Stack.size() >= 2) {      Activity last = Activity_Stack.get(Activity_Stack.size() - 2);      if (last instanceof BaseSwipeBackActivity) {        lastActivity = (BaseSwipeBackActivity) last;      }    }  }  @Override  protected void onResume() {    initShadow();    super.onResume();  }  @Override  protected void onDestroy() {    super.onDestroy();    Activity_Stack.remove(this);  }  @Override  public void startActivity(Intent intent) {    super.startActivity(intent);    overridePendingTransition(R.anim.slide_right_in, 0);    lowerActivityExitAnim();  }  @Override  public void startActivityForResult(Intent intent, int requestCode) {    super.startActivityForResult(intent, requestCode);    overridePendingTransition(R.anim.slide_right_in, 0);    lowerActivityExitAnim();  }  @Override  public void finish() {    super.finish();    overridePendingTransition(0, R.anim.slide_right_out);    if (lastActivity != null) lastActivity.lowerActivityEnterAnim(rootView.getTranslationX());    Activity_Stack.remove(this);  }  private void initShadow() {    if (shadowView == null) {      ViewGroup rootGroup = (ViewGroup) (getWindow().getDecorView());      shadowView = new View(this);      rootGroup.addView(shadowView, 0);      ViewGroup.LayoutParams params = shadowView.getLayoutParams();      //阴影宽度      params.width = (int) ((float) ConvertUtil.getWidthInPx() * 0.05f);      params.height = ConvertUtil.getHeightInPx();      shadowView.setLayoutParams(params);      //渐变背景作为阴影      shadowView.setBackgroundResource(R.drawable.shadow_grey_h);      shadowView.setTranslationX(-params.width);      rootView = rootGroup.getChildAt(1);    }  }  @Override  public boolean dispatchTouchEvent(MotionEvent ev) {    if (shouldIntercept) {      return onTouchEvent(ev);    }    switch (ev.getAction()) {      case MotionEvent.ACTION_DOWN: {        downX = ev.getRawX();        downY = ev.getRawY();        hadJudge = false;        break;      }      case MotionEvent.ACTION_MOVE: {        if (hadJudge) break;        if (ev.getRawX() == downX) break;        if (ev.getRawX() < downX) {          //左滑          hadJudge = true;          break;        }        if (ev.getRawX() - downX >= 100) {          //超出判断距离          hadJudge = true;          break;        }        if (ev.getRawX() - downX > 50) {          //x轴右滑50~100px          float rate = (ev.getRawX() - downX) / (Math.abs(ev.getRawY() - downY));          if ((downX < 50 && rate > 0.5f) || rate > 2) {            shouldIntercept = true;          }        }        break;      }      case MotionEvent.ACTION_UP: {        downX = 0;        downY = 0;        shouldIntercept = false;        hadJudge = false;        break;      }    }    //Activity的默认分发    if (ev.getAction() == MotionEvent.ACTION_DOWN) {      onUserInteraction();    }    if (getWindow().superDispatchTouchEvent(ev)) {      return true;    }    return true;  }  @Override  public boolean onTouchEvent(MotionEvent event) {    initShadow();    //测量手指抬起时的速度    if (velocityTracker == null) {      velocityTracker = VelocityTracker.obtain();      maxFlingVelocity = ViewConfiguration.get(this).getScaledMaximumFlingVelocity();    }    velocityTracker.addMovement(event);    switch (event.getAction()) {      case MotionEvent.ACTION_DOWN: {        lastX = event.getRawX();        break;      }      case MotionEvent.ACTION_MOVE: {        if (lastX == -1) {          lastX = event.getRawX();          break;        }        //根据手指滑动距离设置根布局偏移距离        rootView.setTranslationX(rootView.getTranslationX() + event.getRawX() - lastX);        if (rootView.getTranslationX() < 0) rootView.setTranslationX(0);        //阴影跟随根布局移动        shadowView.setTranslationX(-shadowView.getWidth() + rootView.getTranslationX());        //下层activity跟随移动        if (lastActivity != null && lastActivity.rootView != null)          lastActivity.rootView.setTranslationX(-ConvertUtil.getWidthInPx() * 0.3f + rootView.getTranslationX() * 0.3f);        lastX = event.getRawX();        break;      }      case MotionEvent.ACTION_UP: {        //测量手指抬起时的速度        velocityTracker.computeCurrentVelocity(1000, maxFlingVelocity);        float velocityX = velocityTracker.getXVelocity();        if (velocityTracker != null) {          velocityTracker.recycle();          velocityTracker = null;        }        //判断是否返回        if (downX < 50 && velocityX > 1000) {          //手指在左侧边落下，返回          onBack();        } else if (velocityX > 3600) {          //手指快速滑动，返回          onBack();        } else if (rootView.getTranslationX() > ConvertUtil.getWidthInPx() * 0.3) {          //滑动距离超过30%屏幕宽度，返回          onBack();        } else {          //不返回，根布局偏移归零          rootView.animate().translationX(0).setDuration(200).start();          //阴影偏移归零          shadowView.animate().translationX(-shadowView.getWidth()).setDuration(200).start();          //下层activity偏移复原          if (lastActivity != null) lastActivity.lowerActivityExitAnim();        }        lastX = -1;        shouldIntercept = false;        hadJudge = false;        downX = 0;        downY = 0;        break;      }    }    return super.onTouchEvent(event);  }    private void lowerActivityExitAnim() {    if (rootView == null) return;    rootView.animate().translationX(-ConvertUtil.getWidthInPx() * 0.3f).setDuration(300).start();  }  private void lowerActivityEnterAnim(float upperTranslationX) {    if (rootView == null) return;    float r = 1-upperTranslationX/ (float) ConvertUtil.getWidthInPx();    rootView.animate().translationX(0).setDuration(r == 0.0f ? 10 : (long) (300f * r)).start();  }  //退出  abstract public void onBack();}