调用系统相册和系统照相机功能

main.xml

View Code

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <ImageView  
        android:background="#ff0000"
        android:id="@+id/imageView"
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent"/>
</LinearLayout>

 

testCarema.java

 

View Code

import java.io.ByteArrayOutputStream;
import java.io.InputStream;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentResolver;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;

public class testCarema extends Activity
{
    private ImageView imageView;
    private OnClickListener imgViewListener;
    private Bitmap myBitmap;
    private byte[] mContent;

    @ Override
    public void onCreate ( Bundle savedInstanceState )
    {
        super.onCreate(savedInstanceState);
        
        setContentView(R.layout.main);
        
        imageView = (ImageView) findViewById(R.id.imageView);
        imgViewListener = new OnClickListener()
        {
            public void onClick ( View v )
            {
                final CharSequence[] items = { "相册", "拍照" };
                AlertDialog dlg = new AlertDialog.Builder(testCarema.this)
                .setTitle("选择图片").
                setItems(items,
                        new DialogInterface.OnClickListener()
                        {
                            public void onClick ( DialogInterface dialog , int item )
                            {
                                // 这里item是根据选择的方式，
                                // 在items数组里面定义了两种方式，拍照的下标为1所以就调用拍照方法
                                if (item == 1)
                                {
                                    Intent getImageByCamera = new Intent("android.media.action.IMAGE_CAPTURE");
                                    startActivityForResult(getImageByCamera, 1);
                                } else{
                                    Intent getImage = new Intent(Intent.ACTION_GET_CONTENT);
                                    getImage.addCategory(Intent.CATEGORY_OPENABLE);
                                    getImage.setType("image/jpeg");
                                    startActivityForResult(getImage, 0);
                                }
                            }
                        }).create();
                dlg.show();
            }
        };
        // 给imageView控件绑定点点击监听器
        imageView.setOnClickListener(imgViewListener);
    }

    @ Override
    protected void onActivityResult ( int requestCode , int resultCode , Intent data )
    {
        super.onActivityResult(requestCode, resultCode, data);

        ContentResolver resolver = getContentResolver();
        /**
         * 因为两种方式都用到了startActivityForResult方法，
         * 这个方法执行完后都会执行onActivityResult方法， 所以为了区别到底选择了那个方式获取图片要进行判断，
         * 这里的requestCode跟startActivityForResult里面第二个参数对应
         */
        if (requestCode == 0)
        {
            try
            {
                // 获得图片的uri
                Uri originalUri = data.getData();
                // 将图片内容解析成字节数组
                mContent = readStream(resolver.openInputStream(Uri.parse(originalUri.toString())));
                // 将字节数组转换为ImageView可调用的Bitmap对象
                myBitmap = getPicFromBytes(mContent, null);
                // //把得到的图片绑定在控件上显示
                imageView.setImageBitmap(myBitmap);
            } catch ( Exception e )
            {
                System.out.println(e.getMessage());
            }

        } else if (requestCode == 1){
            try
            {
                super.onActivityResult(requestCode, resultCode, data);
                Bundle extras = data.getExtras();
                myBitmap = (Bitmap) extras.get("data");
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                myBitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
                mContent = baos.toByteArray();
            } catch ( Exception e ){
                e.printStackTrace();
            }
            // 把得到的图片绑定在控件上显示
            imageView.setImageBitmap(myBitmap);
        }
    }
    // 将字节数组转换为ImageView可调用的Bitmap对象
    public static Bitmap getPicFromBytes ( byte[] bytes , BitmapFactory.Options opts )
    {
        if (bytes != null)
            if (opts != null)
                return BitmapFactory.decodeByteArray(bytes, 0, bytes.length, opts);
            else
                return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
        return null;
    }
    
    // 将图片内容解析成字节数组
    public static byte[] readStream ( InputStream inStream ) throws Exception
    {
        byte[] buffer = new byte[1024];
        int len = -1;
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        while ((len = inStream.read(buffer)) != -1)
        {
            outStream.write(buffer, 0, len);
        }
        byte[] data = outStream.toByteArray();
        outStream.close();
        inStream.close();
        return data;
    }
}