Android ImageView 点击更换头像

首先搭建布局

主界面布局：

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="horizontal" >
 
     <LinearLayout
         android:id="@+id/ll"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_alignParentRight="true"
         android:gravity="center"
         android:orientation="vertical" >
 
         <ImageView
             android:id="@+id/image_btn"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:background="@null"
             android:src="@drawable/blank" />
 
         <Button
             android:id="@+id/select_btn"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_below="@id/image_btn"
             android:layout_centerHorizontal="true"
             android:text="选择头像" />
     </LinearLayout>
 
     <TableLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_toLeftOf="@id/ll"
         android:stretchColumns="1" >
 
         <TableRow>
 
             <TextView android:text="用户名:" />
 
             <EditText />
         </TableRow>
 
         <TableRow>
 
             <TextView android:text="密码:" />
 
             <EditText />
         </TableRow>
 
         <TableRow>
 
             <TextView android:text="确认密码:" />
 
             <EditText />
         </TableRow>
 
         <TableRow>
 
             <TextView android:text="E-mail地址:" />
 
             <EditText />
         </TableRow>
     </TableLayout>
 
 </RelativeLayout>

DialogActivity布局

 <GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:columnCount="4"
     android:orientation="horizontal" >
 
     <ImageView
         android:id="@+id/image_01"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:background="@null"
         android:src="@drawable/img01" />
 
     <ImageView
         android:id="@+id/image_02"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:background="@null"
         android:src="@drawable/img02" />
 
     <ImageView
         android:id="@+id/image_03"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:background="@null"
         android:src="@drawable/img03" />
 
     <ImageView
         android:id="@+id/image_04"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:background="@null"
         android:src="@drawable/img04" />
 
     <ImageView
         android:id="@+id/image_05"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:background="@null"
         android:src="@drawable/img05" />
 
     <ImageView
         android:id="@+id/image_06"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:background="@null"
         android:src="@drawable/img06" />
 
     <ImageView
         android:id="@+id/image_07"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:background="@null"
         android:src="@drawable/img07" />
 
     <ImageView
         android:id="@+id/image_08"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:background="@null"
         android:src="@drawable/img08" />
 
     <ImageView
         android:id="@+id/image_09"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:background="@null"
         android:src="@drawable/img09" />
 
 </GridLayout>

AndroidManifest.xml中注册活动

  <application
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme" >
         <activity
             android:name=".MainActivity"
             android:label="@string/app_name" >
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
         <activity
             android:name=".DialogActivity"
             android:label="选择头像"
             android:theme="@android:style/Theme.Dialog">
 
         </activity>
     </application>

MainActivity主活动加载布局，点击事件，接收返回的结果

 import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.ImageView;
 
 public class MainActivity extends LifeCycleActivity {
 
     Button select;
     ImageView showPic;
 
     public static final int SELECT_PIC = 1;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
         select = (Button) findViewById(R.id.select_btn);
         showPic = (ImageView) findViewById(R.id.image_btn);
 
         select.setOnClickListener(new OnClickListener() {
             @Override
             public void onClick(View v) {
                 Intent intent = new Intent(MainActivity.this,
                         DialogActivity.class);
                 startActivityForResult(intent, SELECT_PIC);
             }
         });
 
     }
         @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         if (requestCode == SELECT_PIC && resultCode == RESULT_OK) {
             int imgid = data.getIntExtra("image", -1);
             //更换图片
             if(imgid!=-1){
                 showPic.setImageResource(imgid);
             }
         }
     }
 
 }

DialogActivity活动加载布局，返回数据

这里使用两种方式，一种是使用数据，一种是使用反射

 import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.ImageView;
 
 public class DialogActivity extends LifeCycleActivity {
 
     ImageView[] iv = new ImageView[9];
 
 //    int[] ids = { R.id.image_01, R.id.image_02, R.id.image_03, R.id.image_04,
 //            R.id.image_05, R.id.image_06, R.id.image_07, R.id.image_08,
 //            R.id.image_09 };
 //    int[] imgId = { R.drawable.img01, R.drawable.img02, R.drawable.img03,
 //            R.drawable.img04, R.drawable.img05, R.drawable.img06,
 //            R.drawable.img07, R.drawable.img08, R.drawable.img09 };
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_dialog);
 
         //使用反射
         for (int i = 0; i < iv.length; i++) {
             final int finalI = i+1;
             String name = "image_0"+finalI;
             try {
                 //获取其他类
                 Class cls = R.id.class;
                 //获取类的属性,getField(name)获取属性，getInt(null)获取属性对应的值
                 //null代表的是静态变量，非静态变量需要传递对象
                 int id = cls.getField(name).getInt(null);
                 iv[i] = (ImageView) findViewById(id);
                 iv[i].setOnClickListener(new OnClickListener() {
                     @Override
                     public void onClick(View v) {
 
                         //返回数据
                         Intent intent = getIntent();
                         Class cls2 = R.drawable.class;
                         try {
                             //内部类使用外部局部变量，需要final
                             int imgid2 = cls2.getField("img0"+finalI).getInt(null);
                             intent.putExtra("image", imgid2);
                             setResult(RESULT_OK, intent);
                             finish();
                         } catch (Exception e) {
                             e.printStackTrace();
                         }
                     }
                 });
 
             } catch (Exception e) {
                 e.printStackTrace();
             }
         }
 
 //        for (int i = 0; i < iv.length; i++) {
 //            final int finalI = i;
 //            //给每一个ImageView找到id
 //            iv[i] = (ImageView) findViewById(ids[i]);
 //            //设置点击事件监听
 //            iv[i].setOnClickListener(new OnClickListener() {
 //                @Override
 //                public void onClick(View v) {
 //                    //返回数据
 //                    Intent intent = getIntent();
 //                    //内部类使用外部局部变量，需要final
 //                    intent.putExtra("image", imgId[finalI]);
 //                    setResult(RESULT_OK, intent);
 //                    finish();
 //                }
 //            });
 //        }
     }
 
 }

最终效果图