滑动返回

public class BackActivity extends SwipeBackActivity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_swipe_back);
        ImmersionBar.with(this)
                .titleBar(R.id.toolbar)
                .navigationBarColor(R.color.colorPrimary)
                .init();
        SwipeBackLayout mSwipeBackLayout = getSwipeBackLayout();
        mSwipeBackLayout.setEnabled(true);
        // 设置滑动方向，可设置EDGE_LEFT, EDGE_RIGHT, EDGE_ALL, EDGE_BOTTOM
        mSwipeBackLayout.setEdgeTrackingEnabled(SwipeBackLayout.EDGE_LEFT);
        // 滑动退出的效果只能从边界滑动才有效果，如果要扩大touch的范围，可以调用这个方法
        mSwipeBackLayout.setEdgeSize(getWindowWidth2()/2);
        Log.e("ZZP",getWindowWidth0()+","+getWindowWidth1()+","+getWindowWidth2()+","
        +getWindowWidth3());

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        ImmersionBar.with(this).destroy();
    }

    int getWindowWidth0(){
        WindowManager wm = (WindowManager) this
                .getSystemService(Context.WINDOW_SERVICE);
        return wm.getDefaultDisplay().getWidth();
    }
    int getWindowWidth1(){
        WindowManager wm1 = this.getWindowManager();
        return wm1.getDefaultDisplay().getWidth();
    }
    int getWindowWidth2(){
        WindowManager manager = this.getWindowManager();
        DisplayMetrics outMetrics = new DisplayMetrics();
        manager.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.widthPixels;
    }
    int getWindowWidth3(){
        Resources resources = this.getResources();
        DisplayMetrics dm = resources.getDisplayMetrics();
        return dm.widthPixels;
    }
}