Android调用摄像头和相册

点击打开链接

http://blog.youkuaiyun.com/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();
        }
    }
}