获得和裁剪图片

take big picture ,select picture from gallery and crop picture.

1. 照相获得大图片：

照相时，把图片保存到文件中， 可以得到大图片（分辨率很高的图片）， 具体方法：

Intent intent  = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);mImageCaptureUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(),   "tmp_avatar_" + String.valueOf(System.currentTimeMillis()) + ".jpg"));intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mImageCaptureUri);try {intent.putExtra("return-data", true);startActivityForResult(intent, PICK_FROM_CAMERA);} catch (ActivityNotFoundException e) {e.printStackTrace();}

2. 从图库中选择图片：

直接从图库取得图片, 具体方式：

                        Intent intent = new Intent();                intent.setType("image/*");                intent.setAction(Intent.ACTION_GET_CONTENT);                                startActivityForResult(Intent.createChooser(intent, "Complete action using"), PICK_FROM_FILE);

3. 裁剪图片：

首先是已经取得原始图片，然后是检查系统中是否存在裁剪图片的应用，最后是裁剪完成，具体实现：

final ArrayList<CropOption> cropOptions = new ArrayList<CropOption>();        Intent intent = new Intent("com.android.camera.action.CROP");        intent.setType("image/*");        //获得目标应用的个数        List<ResolveInfo> list = getPackageManager().queryIntentActivities( intent, 0 );                int size = list.size();                if (size == 0) {                Toast.makeText(this, "Can not find image crop app", Toast.LENGTH_SHORT).show();                    return;        } else {        intent.setData(mImageCaptureUri);                        intent.putExtra("outputX", 200);            intent.putExtra("outputY", 200);            intent.putExtra("aspectX", 1);            intent.putExtra("aspectY", 2);            intent.putExtra("scale", true);            intent.putExtra("return-data", true);                    if (size == 1) {        Intent i = new Intent(intent);        ResolveInfo res= list.get(0);                i.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));                startActivityForResult(i, CROP_FROM_CAMERA);        } else {        for (ResolveInfo res : list) {        final CropOption co = new CropOption();                co.title = getPackageManager().getApplicationLabel(res.activityInfo.applicationInfo);        co.icon= getPackageManager().getApplicationIcon(res.activityInfo.applicationInfo);        co.appIntent= new Intent(intent);                co.appIntent.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));                    cropOptions.add(co);        }                CropOptionAdapter adapter = new CropOptionAdapter(getApplicationContext(), cropOptions);                AlertDialog.Builder builder = new AlertDialog.Builder(this);        builder.setTitle("Choose Crop App");        builder.setAdapter( adapter, new DialogInterface.OnClickListener() {            public void onClick( DialogInterface dialog, int item ) {                startActivityForResult( cropOptions.get(item).appIntent, CROP_FROM_CAMERA);            }        });                builder.setOnCancelListener( new DialogInterface.OnCancelListener() {            @Override            public void onCancel( DialogInterface dialog ) {                               if (mImageCaptureUri != null ) {                    getContentResolver().delete(mImageCaptureUri, null, null );                    mImageCaptureUri = null;                }            }        } );                AlertDialog alert = builder.create();                alert.show();        }        }

4. 显示最后的图片：

从Intent中获取图片，并显示：

 Bundle extras = data.getExtras();        if (extras != null) {                    Bitmap photo = extras.getParcelable("data");                        mImageView.setImageBitmap(photo);        }        File f = new File(mImageCaptureUri.getPath());                            if (f.exists()) f.delete();        break;

其他的代码：

简单Adapter：显示用户可以做的操作

package net.londatiga.android;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ArrayAdapter;import android.widget.ImageView;import android.widget.TextView;import android.content.Context;import java.util.ArrayList;/** * Adapter for crop option list. *  * @author Lorensius W. L. T <[e-mail]> * */public class CropOptionAdapter extends ArrayAdapter<CropOption> {private ArrayList<CropOption> mOptions;private LayoutInflater mInflater;public CropOptionAdapter(Context context, ArrayList<CropOption> options) {super(context, R.layout.crop_selector, options);mOptions = options;mInflater= LayoutInflater.from(context);}@Overridepublic View getView(int position, View convertView, ViewGroup group) {if (convertView == null)convertView = mInflater.inflate(R.layout.crop_selector, null);CropOption item = mOptions.get(position);if (item != null) {((ImageView) convertView.findViewById(R.id.iv_icon)).setImageDrawable(item.icon);((TextView) convertView.findViewById(R.id.tv_name)).setText(item.title);return convertView;}return null;}}

CropOption.java //记录应用的一些属性

public class CropOption {public CharSequence title;public Drawable icon;public Intent appIntent;}