安卓中选择系统图库的图片及调用相机的源码（原创）

在Android开发中经常会用到图片的上传功能，一般常用的是调用Android系统自带的图库及拍照功能。示例代码如下：

在MainActivity.java中

import java.io.ByteArrayOutputStream;import java.io.File;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.provider.MediaStore;import android.app.Activity;import android.content.Intent;import android.graphics.Bitmap;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.ImageView;public class MainActivity extends Activity {private Button btn1,btn2;private ImageView img;public final static int PHOTO_ZOOM = 0;    public final static int TAKE_PHOTO = 1;    public final static int PHOTO_RESULT = 2;    public static final String IMAGE_UNSPECIFIED = "image/*";    private String imageDir;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);img = (ImageView) findViewById(R.id.avatar);btn1 = (Button) findViewById(R.id.selector);btn2 = (Button) findViewById(R.id.paizhao);btn1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) { Intent intent = new Intent(Intent.ACTION_GET_CONTENT);             intent.setType(IMAGE_UNSPECIFIED);             Intent wrapperIntent=Intent.createChooser(intent, null);             startActivityForResult(wrapperIntent, PHOTO_ZOOM);}});btn2.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) { imageDir = "temp.jpg";             Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);                intent.putExtra(MediaStore.EXTRA_OUTPUT,                        Uri.fromFile(new File(Environment.getExternalStorageDirectory(), imageDir)));                startActivityForResult(intent, TAKE_PHOTO);}});}// 图片缩放public void photoZoom(Uri uri) {        Intent intent = new Intent("com.android.camera.action.CROP");        intent.setDataAndType(uri, IMAGE_UNSPECIFIED);        intent.putExtra("crop", "true");        // aspectX aspectY 是宽高的比例        intent.putExtra("aspectX", 1);        intent.putExtra("aspectY", 1);        // outputX outputY 是裁剪图片宽高        intent.putExtra("outputX", 250);        intent.putExtra("outputY", 250);        intent.putExtra("return-data", true);        startActivityForResult(intent, PHOTO_RESULT);    }@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {if (resultCode == RESULT_OK) {            if (requestCode == PHOTO_ZOOM) {                photoZoom(data.getData());            }            if (requestCode == TAKE_PHOTO) {                File picture = new File(Environment.getExternalStorageDirectory() + "/" + imageDir);                photoZoom(Uri.fromFile(picture));            }            if (requestCode == PHOTO_RESULT) {                Bundle extras = data.getExtras();                if (extras != null) {                    Bitmap photo = extras.getParcelable("data");                    ByteArrayOutputStream stream = new ByteArrayOutputStream();                    photo.compress(Bitmap.CompressFormat.JPEG, 75, stream);                    img.setImageBitmap(photo);                }            }        }super.onActivityResult(requestCode, resultCode, data);}}

activity_main.xml中

效果如图：

因为时间关系，界面就谁便做了，请见谅！！！！！！！！！！！！！！！！！！！！

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