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