实现右滑关闭Activity的简单方法

来源：互联网发布：全身美白知乎编辑：程序博客网时间：2024/06/06 02:59

1、在styles文件中，给主题添加<item name="android:windowIsTranslucent">true</item>

2、项目中添加 SwipeBackLayout.java 和 SwipeBackActivity.java 文件（文件如下），并使Activity继承SwipeBackActivity即可实现简单的右滑删除效果

SwipeBackLayout.java文件public class SwipeBackActivity extends AppCompatActivity {    private SwipeBackLayout mSwipeBackLayout;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));        getWindow().getDecorView().setBackgroundDrawable(null);    }    @Override    public void setContentView(@LayoutRes int layoutResID) {        mSwipeBackLayout = new SwipeBackLayout(this);        View childView = View.inflate(this, layoutResID, null);        mSwipeBackLayout.addView(childView);        super.setContentView(mSwipeBackLayout);    }    @Override    public void setContentView(View view) {        mSwipeBackLayout = new SwipeBackLayout(this);        mSwipeBackLayout.addView(view);        super.setContentView(mSwipeBackLayout);    }}

SwipeBackActivity.java文件
public class SwipeBackLayout extends RelativeLayout {    private ViewDragHelper helper;    private float mScrollPercent;    private float mScrollThreshold = 0.5f;    private static final int OVER_SCROLL_DISTANCE = 10;    public SwipeBackLayout(Context context) {        super(context);        init();    }    public SwipeBackLayout(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public SwipeBackLayout(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    private void init() {        helper = ViewDragHelper.create(this, 1.0f, new ViewDragHelper.Callback() {            @Override            public boolean tryCaptureView(View child, int pointerId) {                boolean ret = helper.isEdgeTouched(ViewDragHelper.EDGE_LEFT, pointerId);                return ret;            }            @Override            public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {                super.onViewPositionChanged(changedView, left, top, dx, dy);                mScrollPercent = Math.abs((float) left / getWidth());                invalidate();                if (mScrollPercent >= 1) {                    Activity act = (Activity) getContext();                    if (!act.isFinishing()) {                        act.finish();                        act.overridePendingTransition(0, 0);                    }                }            }            @Override            public void onViewReleased(View releasedChild, float xvel, float yvel) {                int left = xvel > 0 || xvel == 0 && mScrollPercent > mScrollThreshold ? getWidth() + OVER_SCROLL_DISTANCE : 0;                helper.settleCapturedViewAt(left, 0);                invalidate();            }            @Override            public int getViewHorizontalDragRange(View child) {                return 1;            }            @Override            public int clampViewPositionHorizontal(View child, int left, int dx) {                return Math.max(0, left);            }        });        helper.setEdgeTrackingEnabled(ViewDragHelper.EDGE_LEFT);    }    @Override    public void computeScroll() {        if (helper.continueSettling(true)) {            ViewCompat.postInvalidateOnAnimation(this);        }    }    @Override    public boolean onInterceptTouchEvent(MotionEvent ev) {        boolean ret = helper.shouldInterceptTouchEvent(ev);        return ret;    }    @Override    public boolean onTouchEvent(MotionEvent event) {        helper.processTouchEvent(event);        return true;    }}

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