Android调用摄像头和相册

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http://blog.csdn.net/u012796139/article/details/50084517

//layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.getphotoactivity.MainActivity"><Button
        android:id="@+id/take_photo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="启动相机" /><Button
        android:id="@+id/choose_from_album"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="从相册中选择图片" /><ImageView
        android:id="@+id/picture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal" /></LinearLayout>
//Activity

package com.example.getphotoactivity;import android.annotation.TargetApi;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.Bundle;import android.os.Environment;import android.provider.DocumentsContract;import android.provider.MediaStore;import android.support.v7.app.ActionBarActivity;import android.view.View;import android.widget.Button;import android.widget.ImageView;import android.widget.Toast;import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;public class MainActivity extends ActionBarActivity {private static final String TAG = "hdu";public static final int TAKE_PHOTO = 1;public static final int CROP_PHOTO = 2;public static final int CHOOSE_PHOTO = 3;private Button takePhoto;private ImageView picture;private Uri imageUri;private Button chooseFromAlbum;@Override
    protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);takePhoto = (Button) findViewById(R.id.take_photo);picture = (ImageView) findViewById(R.id.picture);chooseFromAlbum = (Button) findViewById(R.id.choose_from_album);takePhoto.setOnClickListener(new View.OnClickListener() {@Override
            public void onClick(View v) {// 创建File对象，用于存储拍摄后照片
                File saveImage = new File(Environment.getExternalStorageDirectory(), "saveImage.jpg");try {if (saveImage.exists()) {saveImage.delete();}saveImage.createNewFile();}catch (IOException ex) {ex.printStackTrace();}imageUri = Uri.fromFile(saveImage);Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);// 启动相机
                startActivityForResult(intent, TAKE_PHOTO);}});chooseFromAlbum.setOnClickListener(new View.OnClickListener() {@Override
            public void onClick(View v) {Intent intent = new Intent("android.intent.action.GET_CONTENT");intent.setType("image/*");// 打开相册
                startActivityForResult(intent, CHOOSE_PHOTO);}});}@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {switch (requestCode) {case TAKE_PHOTO:if (resultCode == 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);// 启动裁剪程序
                    startActivityForResult(intent, CROP_PHOTO);}break;case CROP_PHOTO:if (resultCode == RESULT_OK) {try {Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));// 显示裁剪后的图片
                        picture.setImageBitmap(bitmap);}catch (FileNotFoundException ex) {ex.printStackTrace();}}break;case CHOOSE_PHOTO:if (resultCode == RESULT_OK) {handleImage(data);}break;default:break;}}// 只在Android4.4及以上版本使用
    @TargetApi(19)private void handleImage(Intent data) {String imagePath = null;Uri uri = data.getData();if (DocumentsContract.isDocumentUri(this, uri)) {// 通过document id来处理
            String docId = DocumentsContract.getDocumentId(uri);if ("com.android.providers.media.documents".equals(uri.getAuthority())) {// 解析出数字id
                String id = docId.split(":")[1];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".equals(uri.getScheme())) {// 如果不是document类型的Uri，则使用普通方式处理
            imagePath = getImagePath(uri, null);}// 根据图片路径显示图片
        displayImage(imagePath);}private String getImagePath(Uri uri, String selection) {String path = null;// 通过Uri和selection来获取真实图片路径
        Cursor cursor = getContentResolver().query(uri, null, selection, null, null);if (cursor != null) {if (cursor.moveToFirst()) {path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));}cursor.close();}return path;}private void displayImage(String imagePath) {if (imagePath != null) {Bitmap bitmap = BitmapFactory.decodeFile(imagePath);picture.setImageBitmap(bitmap);}else {Toast.makeText(this, "failed to get image", Toast.LENGTH_SHORT).show();}}
}

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