Android应用之更换头像

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先来看一下运行图：
下面看一下具体的代码：
MainActivity.java
package cn.bzu.dialog_imageswitcher;import android.os.Bundle;import android.app.Activity;import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.content.DialogInterface.OnClickListener;import android.view.LayoutInflater;import android.view.Menu;import android.view.View;import android.view.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageButton;import android.widget.ImageView;public class MainActivity extends Activity{private ImageButton imageButton;private Gallery gallery;private ImageView imageView;private Integer[] mThumbIds = {R.drawable.aa, R.drawable.bb,R.drawable.cc, R.drawable.dd,R.drawable.ee, R.drawable.ff,R.drawable.gg};private Integer[] mImageIds = {R.drawable.cc, R.drawable.dd,R.drawable.ee, R.drawable.ff,R.drawable.gg };@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);iniComponent();imageButton.setImageResource(R.drawable.cc);imageButton.setOnClickListener(new ImageButtonListener());}// 初始化组件private void iniComponent() {imageButton = (ImageButton) findViewById(R.id.imageButton);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.activity_main, menu);return true;}// 创建适配器private class ImageAdapter extends BaseAdapter {private Context context;public ImageAdapter(Context c) {this.context = c;}public int getCount() {return mThumbIds.length;}public Object getItem(int position) {return position;}public long getItemId(int position) {return position;}// 获取视图public View getView(int position, View convertView, ViewGroup parent) {ImageView imageView = new ImageView(context);imageView.setImageResource(mThumbIds[position]);imageView.setAdjustViewBounds(true);imageView.setLayoutParams(new Gallery.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));return imageView;}}private class ImageButtonListener implementsandroid.view.View.OnClickListener {public void onClick(View v) {AlertDialog.Builder imageSelect = new AlertDialog.Builder(MainActivity.this);LayoutInflater layoutInflater = LayoutInflater.from(MainActivity.this);View galleryView = layoutInflater.inflate(R.layout.activity_gallery, null);gallery = (Gallery) galleryView.findViewById(R.id.gallery);gallery.setAdapter(new ImageAdapter(MainActivity.this));gallery.setOnItemClickListener(new ItemClickListener());imageSelect.setIcon(android.R.drawable.btn_star).setView(galleryView).setTitle("头像选择").setPositiveButton("确定", new OnClickListener() {public void onClick(DialogInterface dialog, int which) {}}).create().show();}}private class ItemClickListener implements OnItemClickListener{public void onItemClick(AdapterView<?> parent, View view, final int position,long id) {AlertDialog.Builder imageSelect = new AlertDialog.Builder(MainActivity.this);LayoutInflater layoutInflater = LayoutInflater.from(MainActivity.this);View layoutview = layoutInflater.inflate(R.layout.activity_image, null);imageView = (ImageView) layoutview.findViewById(R.id.imageView);imageView.setImageResource(mImageIds[position]);imageSelect.setView(layoutview).setPositiveButton("确定", new OnClickListener() {public void onClick(DialogInterface dialog, int which) {imageButton.setImageResource(mThumbIds[position]);}}).create().show();}}}

下面是布局文件：
activity_main.xml：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@drawable/gh"    android:orientation="vertical" >    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:padding="@dimen/padding_medium"        android:text="@string/prompt"        tools:context=".MainActivity" />    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:orientation="horizontal" >        <ImageButton            android:id="@+id/imageButton"            android:layout_width="wrap_content"            android:layout_height="wrap_content"             android:contentDescription="@string/app_name"            />        <EditText            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:ems="10"            android:hint="@string/info" >            <requestFocus />        </EditText>    </LinearLayout></LinearLayout>

activity_gallery.xml：
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Gallery         android:id="@+id/gallery"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:spacing="2dp"        /></LinearLayout>
activity_image.xml：
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <ImageView         android:id="@+id/imageView"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:contentDescription="@string/app_name"        /></LinearLayout>

必要的需要在strings.xml中配置一下就OK了！

 	
					
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