Andrid 简易实现画面随意移动并显示坐标。

本文通过FrameLayout和LinearLayout来布局，并通过捕捉onTouchEvent事件来实现画面的随意移动，并同时显示移动后画面坐标。

 

1、先上布局文件：main.xml

<?xml version="1.0" encoding="utf-8"?> 
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent"> 
    <LinearLayout android:id="@+id/container"
        android:layout_width="fill_parent"
		android:layout_height="fill_parent"
		android:orientation="horizontal">
		
        <ImageView android:src="@drawable/icon1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
		         
    </LinearLayout>
    
    <LinearLayout android:id="@+id/showXY"
        android:layout_width="fill_parent"
		android:layout_height="wrap_content"
		android:layout_gravity="bottom"
		android:orientation="horizontal">
		
        <TextView android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5px"
            android:text="当前坐标："/>
        
        <TextView android:id="@+id/xyValue"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5px"
            android:text="0,0"/>                 
    </LinearLayout>    
</FrameLayout> 

2、Activity代码，MainActivity.java：

package org.shuxiang.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.Window;
import android.widget.LinearLayout;
import android.widget.TextView;

public class MainActivity extends Activity
{
	private LinearLayout container; 
	private int currentX; 
    private int currentY; 
    private TextView xyValue;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.main);
    
        container = (LinearLayout) findViewById(R.id.container);
        xyValue = (TextView) findViewById(R.id.xyValue);
        
    }
    
    @Override  
    public boolean onTouchEvent(MotionEvent event)
    { 
      switch (event.getAction())
      { 
          case MotionEvent.ACTION_DOWN:
          { 
              currentX = (int) event.getRawX(); 
              currentY = (int) event.getRawY(); 
              break; 
          }   
          case MotionEvent.ACTION_MOVE:
          { 
              int x2 = (int) event.getRawX(); 
              int y2 = (int) event.getRawY(); 
              container.scrollBy(currentX - x2 , currentY - y2); 
              currentX = x2; 
              currentY = y2;
              xyValue.setText(x2 + "," + y2);
              break; 
          }    
          case MotionEvent.ACTION_UP:
          { 
              break; 
          } 
      } 
        return true;  
    } 
}