Android 调用系统相机拍摄获取照片的两种方法实现实例

<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:gravity="center_horizontal"  
  > 
 
  <Button 
    android:id="@+id/button1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="拍照获取缩略图" /> 
 
  <Button 
    android:id="@+id/button2" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginTop="14dp" 
    android:text="拍照获取原图" /> 
 
  <ImageView 
    android:id="@+id/imageView1" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:src="@drawable/ic_launcher" /> 
 
</LinearLayout> 

package com.example.cameardemo; 
 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
 
import android.content.Intent; 
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.support.v7.app.ActionBarActivity; 
import android.util.Log; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.ImageView; 
 
public class MainActivity extends ActionBarActivity implements OnClickListener { 
 
  private static int REQUEST_THUMBNAIL = 1;// 请求缩略图信号标识 
  private static int REQUEST_ORIGINAL = 2;// 请求原图信号标识 
  private Button button1, button2; 
  private ImageView mImageView; 
  private String sdPath;//SD卡的路径 
  private String picPath;//图片存储路径 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.fragment_main); 
 
    button1 = (Button) findViewById(R.id.button1); 
    button2 = (Button) findViewById(R.id.button2); 
    mImageView = (ImageView) findViewById(R.id.imageView1); 
 
    button1.setOnClickListener(this); 
    button2.setOnClickListener(this); 
    //获取SD卡的路径 
    sdPath = Environment.getExternalStorageDirectory().getPath(); 
    picPath = sdPath + "/" + "temp.png"; 
    Log.e("sdPath1",sdPath); 
  } 
 
  @Override 
  public void onClick(View view) { 
    switch (view.getId()) { 
    case R.id.button1://第一种方法，获取压缩图 
      Intent intent1 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
      // 启动相机 
      startActivityForResult(intent1, REQUEST_THUMBNAIL); 
      break; 
 
    case R.id.button2://第二种方法，获取原图 
      Intent intent2 = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
      Uri uri = Uri.fromFile(new File(picPath)); 
      //为拍摄的图片指定一个存储的路径 
      intent2.putExtra(MediaStore.EXTRA_OUTPUT, uri); 
      startActivityForResult(intent2, REQUEST_ORIGINAL); 
      break; 
 
    default: 
      break; 
    } 
  } 
 
  /** 
   * 返回应用时回调方法 
   */ 
  @Override 
  protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 
 
    if (resultCode == RESULT_OK) { 
      if (requestCode == REQUEST_THUMBNAIL) {//对应第一种方法 
        /** 
         * 通过这种方法取出的拍摄会默认压缩，因为如果相机的像素比较高拍摄出来的图会比较高清， 
         * 如果图太大会造成内存溢出（OOM），因此此种方法会默认给图片尽心压缩 
         */ 
        Bundle bundle = data.getExtras(); 
        Bitmap bitmap = (Bitmap) bundle.get("data"); 
        mImageView.setImageBitmap(bitmap); 
      } 
      else if(resultCode == REQUEST_ORIGINAL){//对应第二种方法 
        /** 
         * 这种方法是通过内存卡的路径进行读取图片，所以的到的图片是拍摄的原图 
         */ 
        FileInputStream fis = null; 
        try { 
          Log.e("sdPath2",picPath); 
          //把图片转化为字节流 
          fis = new FileInputStream(picPath); 
          //把流转化图片 
          Bitmap bitmap = BitmapFactory.decodeStream(fis); 
          mImageView.setImageBitmap(bitmap); 
        } catch (FileNotFoundException e) { 
          e.printStackTrace(); 
        }finally{ 
          try { 
            fis.close();//关闭流 
          } catch (IOException e) { 
            e.printStackTrace(); 
          } 
        } 
      } 
    } 
  } 
 
} 

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
  package="com.example.cameardemo" 
  android:versionCode="1" 
  android:versionName="1.0" > 
 
  <uses-sdk 
    android:minSdkVersion="8" 
    android:targetSdkVersion="19" /> 
  <!-- 操作sd卡的权限 --> 
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 
   
  <application 
    android:allowBackup="true" 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 
    <activity 
      android:name="com.example.cameardemo.MainActivity" 
      android:label="@string/app_name" > 
      <intent-filter> 
        <action android:name="android.intent.action.MAIN" /> 
 
        <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
       
      <!-- 具有相机功能 --> 
      <intent-filter > 
        <action android:name="android.media.action.IMAGE_CAPTURE"/> 
         
        <category android:name="android.intent.category.DEFAULT" /> 
      </intent-filter> 
    </activity> 
  </application> 
 
</manifest>