1 开通两个权限

2

android:id="@+id/layout1"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="@drawable/white"

xmlns:android="http://schemas.android.com/apk/res/android"

>

android:id="@+id/myEdit"

android:layout_width="280px"

android:layout_height="wrap_content"

android:text="http://"

android:textSize="12sp"

android:layout_x="20px"

android:layout_y="42px"

>

android:id="@+id/myText"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="@string/str_title"

android:textSize="16sp"

android:textColor="@drawable/black"

android:layout_x="20px"

android:layout_y="12px"

>

android:id="@+id/myButton1"

android:layout_width="80px"

android:layout_height="45px"

android:text="@string/str_button1"

android:layout_x="70px"

android:layout_y="102px"

>

android:id="@+id/myButton2"

android:layout_width="80px"

android:layout_height="45px"

android:text="@string/str_button2"

android:layout_x="150px"

android:layout_y="102px"

>

android:id="@+id/myImage"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_x="20px"

android:layout_y="152px"

>

3

package dfzy.EX094;

/* import相关class */

import java.net.URL;

import java.net.URLConnection;

import java.net.URLConnection;

import dfzy.EX094.R;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ImageView;

public class EX094 extends Activity

{

/* 变量声明 */

private Button mButton1;

private Button mButton2;

private EditText mEditText;

private ImageView mImageView;

private Bitmap bm;

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

/* 初始化对象 */

mButton1 =(Button) findViewById(R.id.myButton1);

mButton2 =(Button) findViewById(R.id.myButton2);

mEditText = (EditText) findViewById(R.id.myEdit);

mImageView = (ImageView) findViewById(R.id.myImage);

mButton2.setEnabled(false);

/* 预览图片的Button */

mButton1.setOnClickListener(new Button.OnClickListener()

{

@Override

public void onClick(View v)

{

String path=mEditText.getText().toString();

if(path.equals(""))

{

showDialog("网址不可为空白!");

}

else

{

/* 传入type=1为预览图片 */

setImage(path,1);

}

}

});

/* 将图片设为桌面的Button */

mButton2.setOnClickListener(new Button.OnClickListener()

{

@Override

public void onClick(View v)

{

try

{

String path=mEditText.getText().toString();

if(path.equals(""))

{

showDialog("网址不可为空白!");

}

else

{

/* 传入type=2为设置桌面 */

setImage(path,2);

}

}

catch (Exception e)

{

showDialog("读取错误!!");

bm = null;

mImageView.setImageBitmap(bm);

mButton2.setEnabled(false);

e.printStackTrace();

}

}

});

}

/* 将图片抓下来预览或并设置为桌面的方法 */

private void setImage(String path,int type)

{

try

{

URL url = new URL(path);

URLConnection conn = url.openConnection();

conn.connect();

if(type==1)

{

/* 预览图片 */

bm = BitmapFactory.decodeStream(conn.getInputStream());

mImageView.setImageBitmap(bm);

mButton2.setEnabled(true);

}

else if(type==2)

{

/* 设置为桌面 */

EX094.this.setWallpaper(conn.getInputStream());

bm = null;

mImageView.setImageBitmap(bm);

mButton2.setEnabled(false);

showDialog("桌面背景设置完成!");

}

}

catch (Exception e)

{

showDialog("读取错误!网址可能不是图片或网址错误!");

bm = null;

mImageView.setImageBitmap(bm);

mButton2.setEnabled(false);

e.printStackTrace();

}

}

/* 跳出Dialog的方法 */

private void showDialog(String mess){

new AlertDialog.Builder(EX094.this).setTitle("Message")

.setMessage(mess)

.setNegativeButton("确定", new DialogInterface.OnClickListener()

{

public void onClick(DialogInterface dialog, int which)

{

}

})

.show();

}

}4 效果是对的，不展示了