內容概要
可以選擇自己喜歡的圖片進行壁紙設置
所需方法
1、使用WallpaperManager的setResource(int ResourceID)方法
2、使用WallpaperManager的setBitmap(Bitmap bitmap)方法
3、重寫ContextWrapper 類中提供的setWallpaper()
4.傳入9張自己喜歡的圖片,命名image1-image9
Mainfest中加入權限:
<uses-permission android:name="android.permission.SET_WALLPAPER"/>
佈局代碼
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="#000000"
tools:context=".MainActivity" >
<ImageSwitcher
android:id="@+id/ImageSwitcher"
android:layout_width="fill_parent"
android:layout_height="370dp">
</ImageSwitcher>
<Gallery
android:id="@+id/Gallery"
android:layout_width="fill_parent"
android:layout_height="80dp"
android:layout_below="@+id/ImageSwitcher" />
<Button
android:id="@+id/BtnGo"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:layout_below="@+id/Gallery"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="@string/BtnGo" />
</RelativeLayout>
ImageAdapter類
使用Gallery來實現一個可以供用戶選擇的縮略圖列表,當用戶選擇列表中的圖像時,會在ImageSwitcher控件中顯示出當前圖像,當點擊Button時,當前圖片將被設置爲壁紙。其實這裏的ImageSwitcher完全可以替換爲ImageView,考慮到ImageSwitcher可以提供較好的動畫效果,所以我們在這裏選擇了ImageSwitcher。同樣地,我們繼續使用Android開發學習之Gallery中的那個ImageAdapter類:
代碼:
package com.android.gallery2switcher;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
public class ImageAdapter extends BaseAdapter{
//類成員myContext爲context父類
private Context myContext;
private int[] myImages;
//構造函數,有兩個參數,即要存儲的Context和Images數組
public ImageAdapter(Context c,int[] Images)
{
// TODO Auto-generated constructor stub
this.myContext=c;
this.myImages=Images;
}
//返回所有的圖片總數量
@Override
public int getCount()
{
return this.myImages.length;
}
//利用getItem方法,取得目前容器中圖像的數組ID
@Override
public Object getItem(int position)
{
return position;
}
@Override
public long getItemId(int position)
{
return position;
}
//取得目前欲顯示的圖像的VIEW,傳入數組ID值使之讀取與成像
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
ImageView image=new ImageView(this.myContext);
image.setImageResource(this.myImages[position]);
image.setScaleType(ImageView.ScaleType.FIT_XY);
image.setAdjustViewBounds(true);
return image;
}
}
main代碼
package com.android.gallery2switcher;
import java.io.IOException;
import android.os.Bundle;
import android.app.Activity;
import android.app.WallpaperManager;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Button;
import android.widget.Gallery;
import android.widget.Gallery.LayoutParams;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher.ViewFactory;
public class MainActivity extends Activity {
Gallery mGallery;
ImageSwitcher mSwitcher;
Button BtnGo;
int[] Resources=new int[]{
R.drawable.image0,R.drawable.image1,R.drawable.image2,R.drawable.image3,
R.drawable.image4,R.drawable.image5,R.drawable.image6,R.drawable.image7,R.drawable.image8};
int index;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//不顯示標題欄
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
mGallery=(Gallery)findViewById(R.id.Gallery);
mSwitcher=(ImageSwitcher)findViewById(R.id.ImageSwitcher);
//實現ImageSwitcher的工廠接口
mSwitcher.setFactory(new ViewFactory()
{
@Override
public View makeView()
{
ImageView i = new ImageView(MainActivity.this);
i.setBackgroundColor(0xFF000000);
i.setScaleType(ImageView.ScaleType.FIT_CENTER);
i.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
return i;
}
});
//設置資源
mSwitcher.setImageResource(Resources[0]);
//設置動畫
mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_in));
mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_out));
BtnGo=(Button)findViewById(R.id.BtnGo);
BtnGo.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View arg0)
{
SetWallPaper();
}
});
ImageAdapter mAdapter=new ImageAdapter(this,Resources);
mGallery.setAdapter(mAdapter);
mGallery.setOnItemSelectedListener(new OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> Adapter, View view,int position, long id)
{
//設置圖片
mSwitcher.setImageResource(Resources[position]);
//獲取當前圖片索引
index=position;
}
@Override
public void onNothingSelected(AdapterView<?> arg0)
{
}
});
}
//設置壁紙
public void SetWallPaper()
{
WallpaperManager mWallManager=WallpaperManager.getInstance(this);
try
{
mWallManager.setResource(Resources[index]);
}
catch (IOException e)
{
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
return true;
}
}
實現效果圖
可左右拖動:
點擊設置壁紙後: