以下是我的代码,我想使用壁纸管理器设置为壁纸.我正在使用Universal Image Loader,但我不知道如何实现壁纸管理器.我的setWall()不起作用,有点令人困惑.

import android.graphics.Bitmap;

import android.os.Bundle;

import android.os.Parcelable;

import android.support.v4.view.PagerAdapter;

import android.support.v4.view.ViewPager;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.animation.Animation;

import android.view.animation.AnimationUtils;

import android.widget.ImageView;

import android.widget.ProgressBar;

import android.widget.Toast;

import com.nostra13.universalimageloader.core.DisplayImageOptions;

import com.nostra13.universalimageloader.core.assist.FailReason;

import com.nostra13.universalimageloader.core.assist.ImageLoadingListener;

import com.nostra13.universalimageloader.core.assist.ImageScaleType;

public class ImageActivity extends BaseActivity {

private DisplayImageOptions imageoptions;

private ViewPager imagepager;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.imagepager);

Bundle bundle = getIntent().getExtras();

String[] imageUrls = bundle.getStringArray(Extra.IMAGES);

int pagerPosition = bundle.getInt(Extra.IMAGE_POSITION, 0);

imageoptions = new DisplayImageOptions.Builder()

.showImageForEmptyUri(R.drawable.noimage)

.cacheOnDisc()

.imageScaleType(ImageScaleType.EXACT)

.build();

imagepager= (ViewPager) findViewById(R.id.imagepager);

imagepager.setAdapter(new ImagePagerAdapter(imageUrls));

imagepager.setCurrentItem(pagerPosition);

}

public void setWall() {

WallpaperManager myWallpaperManager

= WallpaperManager.getInstance(getApplicationContext());

try {

myWallpaperManager.setResource(R.drawable.app_icon); //

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.main_menu, menu);

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

switch (item.getItemId()) {

case R.id.setWall:

setWall();

return true;

default:

return false;

}

}

@Override

protected void onStop() {

imageLoader.stop();

super.onStop();

}

private class ImagePagerAdapter extends PagerAdapter {

private String[] images;

private LayoutInflater inflater;

ImagePagerAdapter(String[] images) {

this.images = images;

inflater = getLayoutInflater();

}

@Override

public void destroyItem(View container, int position, Object object) {

((ViewPager) container).removeView((View) object);

}

@Override

public void finishUpdate(View container) {

}

@Override

public int getCount() {

return images.length;

}

@Override

public Object instantiateItem(View view, int position) {

final View imageLayout = inflater.inflate(R.layout.item_pager_image, null);

final ImageView imageView = (ImageView) imageLayout.findViewById(R.id.image);

final ProgressBar spinner = (ProgressBar) imageLayout.findViewById(R.id.loading);

imageLoader.displayImage(images[position], imageView, imageoptions, new ImageLoadingListener() {

public void onLoadingStarted() {

spinner.setVisibility(View.VISIBLE);

}

public void onLoadingFailed(FailReason failReason) {

String message = null;

switch (failReason) {

case IO_ERROR:

message = "Input/Output error";

break;

case OUT_OF_MEMORY:

message = "Out Of Memory error";

break;

case UNKNOWN:

message = "Unknown error";

break;

}

Toast.makeText(ImagePagerActivity.this, message, Toast.LENGTH_SHORT).show();

spinner.setVisibility(View.GONE);

imageView.setImageResource(android.R.drawable.ic_delete);

}

public void onLoadingComplete(Bitmap loadedImage) {

spinner.setVisibility(View.GONE);

Animation anim = AnimationUtils.loadAnimation(ImagePagerActivity.this, R.anim.fade_in);

imageView.setAnimation(anim);

anim.start();

}

public void onLoadingCancelled() {

// Do nothing

}

});

((ViewPager) view).addView(imageLayout, 0);

return imageLayout;

}

@Override

public boolean isViewFromObject(View view, Object object) {

return view.equals(object);

}

@Override

public void restoreState(Parcelable state, ClassLoader loader) {

}

@Override

public Parcelable saveState() {

return null;

}

@Override

public void startUpdate(View container) {

}

}

}