Android ImageView 点击更换头像

首先搭建布局

主界面布局：

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     android:layout_width="match_parent"
 3     android:layout_height="match_parent"
 4     android:orientation="horizontal" >
 5 
 6     <LinearLayout
 7         android:id="@+id/ll"
 8         android:layout_width="wrap_content"
 9         android:layout_height="wrap_content"
10         android:layout_alignParentRight="true"
11         android:gravity="center"
12         android:orientation="vertical" >
13 
14         <ImageView
15             android:id="@+id/image_btn"
16             android:layout_width="wrap_content"
17             android:layout_height="wrap_content"
18             android:background="@null"
19             android:src="@drawable/blank" />
20 
21         <Button
22             android:id="@+id/select_btn"
23             android:layout_width="wrap_content"
24             android:layout_height="wrap_content"
25             android:layout_below="@id/image_btn"
26             android:layout_centerHorizontal="true"
27             android:text="选择头像" />
28     </LinearLayout>
29 
30     <TableLayout
31         android:layout_width="wrap_content"
32         android:layout_height="wrap_content"
33         android:layout_toLeftOf="@id/ll"
34         android:stretchColumns="1" >
35 
36         <TableRow>
37 
38             <TextView android:text="用户名:" />
39 
40             <EditText />
41         </TableRow>
42 
43         <TableRow>
44 
45             <TextView android:text="密码:" />
46 
47             <EditText />
48         </TableRow>
49 
50         <TableRow>
51 
52             <TextView android:text="确认密码:" />
53 
54             <EditText />
55         </TableRow>
56 
57         <TableRow>
58 
59             <TextView android:text="E-mail地址:" />
60 
61             <EditText />
62         </TableRow>
63     </TableLayout>
64 
65 </RelativeLayout>

DialogActivity布局

 1 <GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     android:layout_width="match_parent"
 3     android:layout_height="match_parent"
 4     android:columnCount="4"
 5     android:orientation="horizontal" >
 6 
 7     <ImageView
 8         android:id="@+id/image_01"
 9         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:background="@null"
12         android:src="@drawable/img01" />
13 
14     <ImageView
15         android:id="@+id/image_02"
16         android:layout_width="wrap_content"
17         android:layout_height="wrap_content"
18         android:background="@null"
19         android:src="@drawable/img02" />
20 
21     <ImageView
22         android:id="@+id/image_03"
23         android:layout_width="wrap_content"
24         android:layout_height="wrap_content"
25         android:background="@null"
26         android:src="@drawable/img03" />
27 
28     <ImageView
29         android:id="@+id/image_04"
30         android:layout_width="wrap_content"
31         android:layout_height="wrap_content"
32         android:background="@null"
33         android:src="@drawable/img04" />
34 
35     <ImageView
36         android:id="@+id/image_05"
37         android:layout_width="wrap_content"
38         android:layout_height="wrap_content"
39         android:background="@null"
40         android:src="@drawable/img05" />
41 
42     <ImageView
43         android:id="@+id/image_06"
44         android:layout_width="wrap_content"
45         android:layout_height="wrap_content"
46         android:background="@null"
47         android:src="@drawable/img06" />
48 
49     <ImageView
50         android:id="@+id/image_07"
51         android:layout_width="wrap_content"
52         android:layout_height="wrap_content"
53         android:background="@null"
54         android:src="@drawable/img07" />
55 
56     <ImageView
57         android:id="@+id/image_08"
58         android:layout_width="wrap_content"
59         android:layout_height="wrap_content"
60         android:background="@null"
61         android:src="@drawable/img08" />
62 
63     <ImageView
64         android:id="@+id/image_09"
65         android:layout_width="wrap_content"
66         android:layout_height="wrap_content"
67         android:background="@null"
68         android:src="@drawable/img09" />
69 
70 </GridLayout>

AndroidManifest.xml中注册活动

 1  <application
 2         android:allowBackup="true"
 3         android:icon="@drawable/ic_launcher"
 4         android:label="@string/app_name"
 5         android:theme="@style/AppTheme" >
 6         <activity
 7             android:name=".MainActivity"
 8             android:label="@string/app_name" >
 9             <intent-filter>
10                 <action android:name="android.intent.action.MAIN" />
11 
12                 <category android:name="android.intent.category.LAUNCHER" />
13             </intent-filter>
14         </activity>
15         <activity 
16             android:name=".DialogActivity"
17             android:label="选择头像"
18             android:theme="@android:style/Theme.Dialog">
19             
20         </activity>
21     </application>

MainActivity主活动加载布局，点击事件，接收返回的结果

 1 import android.content.Intent;
 2 import android.os.Bundle;
 3 import android.view.View;
 4 import android.view.View.OnClickListener;
 5 import android.widget.Button;
 6 import android.widget.ImageView;
 7 
 8 public class MainActivity extends LifeCycleActivity {
 9 
10     Button select;
11     ImageView showPic;
12 
13     public static final int SELECT_PIC = 1;
14 
15     @Override
16     protected void onCreate(Bundle savedInstanceState) {
17         super.onCreate(savedInstanceState);
18         setContentView(R.layout.activity_main);
19 
20         select = (Button) findViewById(R.id.select_btn);
21         showPic = (ImageView) findViewById(R.id.image_btn);
22 
23         select.setOnClickListener(new OnClickListener() {
24             @Override
25             public void onClick(View v) {
26                 Intent intent = new Intent(MainActivity.this,
27                         DialogActivity.class);
28                 startActivityForResult(intent, SELECT_PIC);
29             }
30         });
31 
32     }
33         @Override
34     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
35         if (requestCode == SELECT_PIC && resultCode == RESULT_OK) {
36             int imgid = data.getIntExtra("image", -1);
37             //更换图片
38             if(imgid!=-1){
39                 showPic.setImageResource(imgid);
40             }
41         }
42     }
43 
44 }
45 
46

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

 1 import android.content.Intent;
 2 import android.os.Bundle;
 3 import android.view.View;
 4 import android.view.View.OnClickListener;
 5 import android.widget.ImageView;
 6 
 7 public class DialogActivity extends LifeCycleActivity {
 8 
 9     ImageView[] iv = new ImageView[9];
10     
11 //    int[] ids = { R.id.image_01, R.id.image_02, R.id.image_03, R.id.image_04,
12 //            R.id.image_05, R.id.image_06, R.id.image_07, R.id.image_08,
13 //            R.id.image_09 };
14 //    int[] imgId = { R.drawable.img01, R.drawable.img02, R.drawable.img03,
15 //            R.drawable.img04, R.drawable.img05, R.drawable.img06,
16 //            R.drawable.img07, R.drawable.img08, R.drawable.img09 };
17 
18     @Override
19     protected void onCreate(Bundle savedInstanceState) {
20         super.onCreate(savedInstanceState);
21         setContentView(R.layout.activity_dialog);
22         
23         //使用反射
24         for (int i = 0; i < iv.length; i++) {
25             final int finalI = i+1;
26             String name = "image_0"+finalI;
27             try {
28                 //获取其他类
29                 Class cls = R.id.class;
30                 //获取类的属性,getField(name)获取属性，getInt(null)获取属性对应的值
31                 //null代表的是静态变量，非静态变量需要传递对象
32                 int id = cls.getField(name).getInt(null);
33                 iv[i] = (ImageView) findViewById(id);
34                 iv[i].setOnClickListener(new OnClickListener() {
35                     @Override
36                     public void onClick(View v) {
37                         
38                         //返回数据
39                         Intent intent = getIntent();
40                         Class cls2 = R.drawable.class;
41                         try {
42                             //内部类使用外部局部变量，需要final
43                             int imgid2 = cls2.getField("img0"+finalI).getInt(null);
44                             intent.putExtra("image", imgid2);
45                             setResult(RESULT_OK, intent);
46                             finish();
47                         } catch (Exception e) {
48                             e.printStackTrace();
49                         }
50                     }
51                 });
52                 
53             } catch (Exception e) {
54                 e.printStackTrace();
55             } 
56         }
57 
58 //        for (int i = 0; i < iv.length; i++) {
59 //            final int finalI = i;
60 //            //给每一个ImageView找到id
61 //            iv[i] = (ImageView) findViewById(ids[i]);
62 //            //设置点击事件监听
63 //            iv[i].setOnClickListener(new OnClickListener() {
64 //                @Override
65 //                public void onClick(View v) {
66 //                    //返回数据
67 //                    Intent intent = getIntent();
68 //                    //内部类使用外部局部变量，需要final
69 //                    intent.putExtra("image", imgId[finalI]);
70 //                    setResult(RESULT_OK, intent);
71 //                    finish();
72 //                }
73 //            });
74 //        }
75     }
76 
77 }

最终效果图