主要代码:(有注释)
package com.example.checkboxtest; import android.annotation.SuppressLint; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.os.Handler; import android.os.Message; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.widget.Toast; public class MyView extends ViewGroup { View leftView = null; View rightView = null; public MyView(Context context, AttributeSet attrs) { super(context, attrs); View view = new View(context, attrs); view.setBackgroundColor(Color.BLACK); this.addView(view, 0); } /** * 测量 */ @SuppressLint("DrawAllocation") @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { if (getChildCount() != 2) { try { // 自定义Exception throw new Exception() { @Override public void printStackTrace() { System.err.println("MyView中只能存在一个View"); super.printStackTrace(); } }; } catch (Exception e) { e.printStackTrace(); } } leftView = getChildAt(0); // 设置leftview的高和宽 leftView.measure(widthMeasureSpec, heightMeasureSpec); rightView = getChildAt(1); // 设置rightview的高和宽 rightView.measure(widthMeasureSpec, heightMeasureSpec); super.onMeasure(widthMeasureSpec, heightMeasureSpec); } /** * 布局 */ @SuppressLint("NewApi") @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { System.out.println(l + "," + t + "," + r + "," + b); if (leftView != null & rightView != null) { // 设置leftview的位置,在屏幕右侧(初始不可见) leftView.layout(-r, 0, 0, b); // 设置rightView的位置,在屏幕中 rightView.layout(l, t, r, b); } } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); } @SuppressLint("NewApi") @Override public boolean onTouchEvent(MotionEvent event) { final float X = event.getX(); float Y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_MOVE: System.out.println("X:" + X); if (X < 100) { scrollTo(0, 0); } else if (X > rightView.getMeasuredWidth() - 100) {// 当用户滑动至离右边缘100时,页面关闭 new Thread(new Runnable() {// 新建线程,滑动关闭 @Override public void run() { for (int i = 0;; i++) { try { Thread.sleep(10);// rightView每隔10ms右移3,保证滑动流畅 } catch (InterruptedException e) { e.printStackTrace(); } int len = (int) (X + 3 * i); // System.out.println("len:" + len); Message message = new Message();// android中非UI线程不允许直接操作控件,可以将消息发送至主线程的handler类 if (len >= rightView.getMeasuredWidth()) { message.what = 1; handler.sendMessage(message);// 发送消息 // 关闭View break; } else { message.what = 0; // 发送消息 自动滑动 handler.sendMessage(message); } } } }).start(); } else { scrollTo((int) -X, 0); // 计算透明度信息 float alpha = (float) (1.0 - (float) (1.0 / 400) * X); // System.out.println("alpha:" + al); // 设置透明度 leftView.setAlpha(alpha); } break; } // 设置true,消费event事件,不在向外传递 return true; } @SuppressLint("HandlerLeak") Handler handler = new Handler() { @SuppressLint("NewApi") @Override public void handleMessage(Message msg) { if (msg.what == 0) { scrollBy(-3, 0);// viewgroup向右滑动3 } else if (msg.what == 1) { Toast.makeText(getContext(), "关闭", 50).show(); setVisibility(View.GONE);// 设置viewgroup不可见(隐藏) } } }; }
使用:
<com.example.checkboxtest.MyView android:layout_width="fill_parent" android:layout_height="fill_parent" > <View android:id="@+id/rightview" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#ff0000" /> </com.example.checkboxtest.MyView>
要显示底下的activity界面需要使用Fragment的add方法
//新建一个Fragment Fragment bFragment = new BFragment(); getFragmentManager().beginTransaction().add(R.id.fragment, bFragment).commit();
工程源码下载:http://pan.baidu.com/share/link?shareid=866490907&uk=1141451701