Android调用摄像头拍照和从相册中选择（上传、更换头像）

Android调用摄像头拍照和从相册中选择（上传、更换头像）

1.布局文件里写两个按钮一个为拍照一个为从相册中选择，还有一个ImageVIew用来放头像

    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
  android:orientation="vertical"
    tools:context="com.example.choosepictest.MainActivity" >

          android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:text="拍照"
      android:id="@+id/but1"
      />
            android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:text="从相册中选择"
      android:id="@+id/but2"
      />
            android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/img"
        />

2.MainActivity中直接贴代码

package com.example.choosepictest;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import android.annotation.SuppressLint;
import android.content.ContentUris;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.ContactsContract.Contacts.Data;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.provider.MediaStore.Images.Media;
import android.support.v7.app.ActionBarActivity;
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 ActionBarActivity {
public static final int TAKE_PHOTO=1;
public static final int CROP_PHOTO=2;
private Button takephoto;
private ImageView picture;
private Uri imageUri;

public static final int CHOOSE_PHOTO=3;
private Button choose;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  takephoto=(Button) findViewById(R.id.but1);
  picture=(ImageView) findViewById(R.id.img);
  choose=(Button) findViewById(R.id.but2);
  takephoto.setOnClickListener(new OnClickListener() {
   
   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    File outputImage=new File(Environment.getExternalStorageDirectory(),
       "output_image.jpg");
   
    try {
     if (outputImage.exists()) {
      outputImage.delete();
     }
     outputImage.createNewFile();
    } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
    imageUri=Uri.fromFile(outputImage);
    Intent intent=new Intent("android.media.action.IMAGE_CAPTURE");
    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
    startActivityForResult(intent, TAKE_PHOTO);
   }
  });
  
  choose.setOnClickListener(new OnClickListener() {
   
   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    Intent intent=new Intent("android.intent.action.GET_CONTENT");
    intent.setType("image/*");
    startActivityForResult(intent, CHOOSE_PHOTO);
   }
  });
 }
@Override
 protected void onActivityResult(int arg0, int arg1, Intent arg2) {
  // TODO Auto-generated method stub
  super.onActivityResult(arg0, arg1, arg2);
  switch (arg0) {
  case TAKE_PHOTO:
   if (arg1==RESULT_OK) {
    Intent intent=new Intent("com.android.camera.action.CROP");
    intent.setDataAndType(imageUri, "image/*");
    intent.putExtra("scale", true);
    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
    startActivityForResult(intent, CROP_PHOTO);
    
   }
   break;
  case CROP_PHOTO:
   if (arg1==RESULT_OK) {
    Bitmap bitmap;
    try {
     bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
     picture.setImageBitmap(bitmap);

    } catch (FileNotFoundException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
   break;
   
  case CHOOSE_PHOTO:
   if (arg1==RESULT_OK) {
    if (Build.VERSION.SDK_INT>=19) {
     handleImageOnKitKat(arg2);
     
    }else{
     handleImageBeforeKitKat(arg2);
    }
   }
   break;
  default:
   break;
  }
 }
 
@SuppressLint("NewApi")
private void handleImageOnKitKat(Intent data) {
 // TODO Auto-generated method stub
String imagePath=null;
Uri uri=data.getData();
if (DocumentsContract.isDocumentUri(this, uri)) {
 String docId=DocumentsContract.getDocumentId(uri);
 if ("com.android.providers.media.documents".equals(uri.getAuthority())) {
  String id=docId.split(":")[1];//解析数字格式的ID
  String selection=MediaStore.Images.Media._ID+"="+id;
  imagePath=getImagePath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,selection);
  
  
 }else if("com.android.providers.downloads.documents".equals(uri.getAuthority())){
  Uri contentUri=ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(docId));
  imagePath=getImagePath(contentUri, null);
  
  
 }
 
}else if("content".equalsIgnoreCase(uri.getScheme())){
 imagePath=getImagePath(uri, null);
 
}
displayImage(imagePath);
}
private void handleImageBeforeKitKat(Intent data){
 Uri uri=data.getData();
 String imagePath=getImagePath(uri, null);
 displayImage(imagePath);
}
private String getImagePath(Uri uri,String selection) {
 // TODO Auto-generated method stub
 String path=null;
 Cursor cursor=getContentResolver().query(uri, null, selection, null, null);
 if (cursor!=null) {
  if (cursor.moveToFirst()) {
   path=cursor.getString(cursor.getColumnIndex(Media.DATA));
   
   
  }
  cursor.close();
 }
 return path;
}
private void displayImage(String imagePath) {
 // TODO Auto-generated method stub
 if (imagePath!=null) {
  Bitmap bitmap=BitmapFactory.decodeFile(imagePath);
  picture.setImageBitmap(bitmap);
  
 }else{
  Toast.makeText(this, "failed to get image", 0).show();
 }
}
}

3.加上权限

具体项目代码见本人博客资源