Android 手机相册图片选择

转载请注明本文出自Jiaxu的专栏（http://blog.csdn.net/u011510784/article/details/48550037），谢谢！

项目开发中经常遇到选择照片或者拍照并上传到服务器上的情况,本文主要介绍手机中图片的选择及显示,废话不多,有图有真相:

    

    

 为提高可移植性,在主函数中的代码很简单,只需要初始化GridView即可,MainActivity中:

package com.example.tackphoto;

import android.content.Context;
import android.os.Bundle;

import com.example.showphoto.GridViewForListView;
import com.example.showphoto.WriteActivity;

public class MainActivity extends WriteActivity {
	private Context context;
	private GridViewForListView mGridView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		context = this;
		mGridView = (GridViewForListView) findViewById(R.id.gridView1);
		setGridViewForListView(context, mGridView);
	}
}

接下来看一下WriteActivity中的setGridViewForListView方法.这里面主要处理图片在GridView上的显示以及GridView的点击事件

public void setGridViewForListView(Context context,
			GridViewForListView mGridView) {
		this.mGridView = mGridView;
		this.context = context;
		dataForGV = new ArrayList<Bitmap>();
		listfile = new ArrayList<String>();
		getImageBitmap();
	}

可以看到,进来后会执行getImageBitmap()方法,在这个方法中会初始化一张添加图片,点击此图片可以进行添加图片操作,在这里面也初始化了GridView的适配器以及点击事件:

		if (adapter == null && dataForGV != null) {
			adapter = new AddPhotoGrideViewAdapter(context, listfile);
			mGridView.setAdapter(adapter);
			addPhotoGrideViewOnItemClickListener = new AddPhotoGrideViewOnItemClickListener(
					context, this, adapter, listfile, SELECTPHOTO, TAKE_PICTURE);
			mGridView
					.setOnItemClickListener(addPhotoGrideViewOnItemClickListener);
		}

先看一下点击监听事件AddPhotoGrideViewOnItemClickListener.class

@Override
	public void onItemClick(AdapterView<?> parent, View view, int position,
			long id) {
		if (adapter != null) {
			if ((adapter.getCount() - 1) == position) {
				if (listfile.size() >= 6) {
					Toast.makeText(context, "最多只能添加六张照片!", Toast.LENGTH_LONG)
							.show();
				} else {
					showmySelectDialog("拍照", "从相册选择");
				}
			} else {
				dialog(position);
			}
		}
	}

如果点的是最后一张,即加号图片,如果添加的图片没有到六张,那么弹出添加图片的dialog;若点击的不是最后一张,那么弹出删除此图片的dialog.

继续看一下选择图片:

	@Override
	public void onClick(View v) {
		Intent intent = null;
		switch (v.getId()) {
		case R.id.tv_one:
			outputFileUri = getOutputFileUri();
			intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
			intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
			activity.startActivityForResult(intent, takePhotoRequest);
			break;
		case R.id.tv_three:
			intent = new Intent();
			intent.setClass(context, ImgFileListActivity.class);
			// intent.putExtra("isSingled", false);
			activity.startActivityForResult(intent, addPhotoRequest);
			break;
		case R.id.tv_cancel:
			dismissSelectDialog();
			break;
		}
	}

tv_one表示点击的是拍照,调用系统照相机拍照,tv_three表示选择手机中的图片,跳入ImgFileListActivity.在这个Activity中用listview的方式显示手机中所有的存放图片文件夹,这段代码在Util类中:

/**
	 * 获取全部图片地址
	 * 
	 * @return
	 */
	public ArrayList<String> listAlldir() {
		Intent intent = new Intent(Intent.ACTION_PICK,
				android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
		Uri uri = intent.getData();
		ArrayList<String> list = new ArrayList<String>();
		String[] proj = { MediaStore.Images.Media.DATA };
		Cursor cursor = context.getContentResolver().query(uri, proj, null,
				null, null);// managedQuery(uri, proj, null, null, null);
		while (cursor.moveToNext()) {
			String path = cursor.getString(0);
			list.add(new File(path).getAbsolutePath());
		}
		return list;
	}

点击listview进入ImgsActivity,查看相应文件里的图片,这里使用GridView显示图片,点击GridView记录选择的图片,点击保存按钮,通过setResult()方法将选择的图片的路径返回到上级Activity,并最终返回到WriteActivity里,在Mainactivity中可以通过以下代码获取选择的图片的路径:

	private List<String> getSelectedImgPath() {
		List<String> imgsPath = getImgPath();
		return imgsPath;
	}

   

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