ImageView显示拍照or本地图片

<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:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.imageview.MainActivity" >

    <Button   
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content"  
        android:text="选择图片" 
        android:id="@+id/selectImage" 
        />    
    <Button   
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        android:text="拍照图片" 
        android:id="@+id/captureImage" 
        />    
    <ImageView
        android:id="@+id/imageView"
        android:maxHeight="1000dip"
        android:maxWidth="1000dip"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_gravity="center_horizontal"
        android:scaleType="fitCenter" />

</LinearLayout>

package com.example.imageview;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.content.ContentResolver;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;


public class MainActivity extends Activity implements OnClickListener {

    private Button selectImage, uploadImage,captureImage;
    private ImageView imageView;
    private Bitmap photo = null;
    private String picPath = null;
    private File file = null;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        selectImage = (Button) this.findViewById(R.id.selectImage);
        captureImage=(Button) this.findViewById(R.id.captureImage);
        selectImage.setOnClickListener(this);
        uploadImage.setOnClickListener(this);
        captureImage.setOnClickListener(this);
        imageView = (ImageView) this.findViewById(R.id.imageView);
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch (v.getId()) {
            case R.id.selectImage: 
                Intent intent = new Intent();
                intent.setType("image/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(intent, 1);
                break;
            case R.id.captureImage:  //照相后显示图片
                destoryBimap();  
                String state = Environment.getExternalStorageState();  
                if (state.equals(Environment.MEDIA_MOUNTED)) {  
                    String saveDir = Environment.getExternalStorageDirectory()  
                         + "/temple";  
                 File dir = new File(saveDir);  
                 if (!dir.exists()) {  
                     dir.mkdir();  
                 }  
                 file = new File(saveDir, "temp.jpg");  
                 file.delete();  
                 if (!file.exists()) {  
                     try {  
                         file.createNewFile();  
                     } catch (IOException e) {  
                         e.printStackTrace();  
                         Toast.makeText(this,"创建临时文件失败",Toast.LENGTH_LONG).show();  
                         return;  
                     }  
                 }  
                 Intent intents = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);  
                 intents.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));  
                 startActivityForResult(intents, 2);  
             } else {  
                 Toast.makeText(this,"存储卡不存在" , Toast.LENGTH_LONG)  .show();  
             }  
            break;    
        default:
            break;
        }
    }
    
    private void destoryBimap() 
    {    
        imageView.setImageBitmap(null);  
        if (photo != null && !photo.isRecycled()) {    
            photo.recycle();     //回收内存，一定要将 imageView中图片设置成null
            photo = null;    
        }    
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode ==1) {   
            if (data != null) {
                Uri uri = data.getData();
                try { 
                    String[] pojo = { MediaStore.Images.Media.DATA };
                    Cursor cursor = getContentResolver().query(uri, pojo, null, null, null);
                    ContentResolver cr = this.getContentResolver();
                    int colunm_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                    cursor.moveToFirst();
                    String path = cursor.getString(colunm_index);

                    if (path.endsWith("jpg") || path.endsWith("png")) {
                        picPath = path;
                        Log.e("图片路径", picPath);
                        
                        //Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
                        //imageView.setImageBitmap(bitmap);
                        //Bitmap bitmap = MediaStore.Images.Media.getBitmap(cr, uri);    
                        
                        Bitmap bitmap = BitmapFactory.decodeFile(picPath);
                        imageView.setImageBitmap(bitmap);
                        Toast.makeText(this, "图片路径"+ picPath, 1000).show();
                    } 
                    else {
                        alert("您选择的不是有效的图片");
                    }    
                } catch (Exception e) {
                    alert("选择图片错误");
                }
            }
            else{
                alert("data is null");
            }
        }
        else if (requestCode ==2){    //拍照后执行    
              if (file != null && file.exists()) {  
                    BitmapFactory.Options options = new BitmapFactory.Options();  
                    options.inSampleSize = 2;  
                    photo = BitmapFactory.decodeFile(file.getPath(), options);  
                    imageView.setImageBitmap(photo);  
                    //picPath = file.getPath();  
                } else {  
                    alert("拍照错误");
                }              
        }
            
        super.onActivityResult(requestCode, resultCode, data);
    }
    
    private void alert(String str) {
        Dialog dialog = new AlertDialog.Builder(this).setTitle("提示")
                .setMessage(str)
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        picPath = null;
                    }
                }).create();
        dialog.show();
    }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.imageview"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="16"
        android:targetSdkVersion="18" />
    
11     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
12     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

    <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>
    </application>

</manifest>