Android获取系统相册图片并裁剪（兼容4.4以上版本）

相信很多同学遇到过在项目中要上传相册中的图片，然而却因为各种版本android手机，会有些不兼容的问题。

我们在打开系统相册时，通常会有两种做法：

Intent.ACTION_PICK  直接打开系统相册

<span style="font-size:18px;">Intent intent = new Intent();
intent.setAction(Intent.ACTION_PICK);</span>

Intent.ACTION_GET_CONTENT 通过内容类型

<span style="font-size:18px;">Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);</span>

选择Intent.ACTION_GET_CONTENT需要做一下兼容处理

<span style="font-size:18px;">if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
     intent.setAction(Intent.ACTION_OPEN_DOCUMENT);
} else {
     intent.setAction(Intent.ACTION_GET_CONTENT);
}</span>

在选择图片的时候，打开相册选择图片（根据是否4.4设置不同action）ACTION_OPEN_DOCUMENT是官方建议

这是一个简单的案例，文章末尾会附带源码：

Activity代码

<span style="font-size:18px;">package com.parcool.mycroppicandupload;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.Calendar;

import com.parcool.mycroppicandupload.utils.AppConstant;
import com.parcool.mycroppicandupload.utils.Utils;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

	private Button btnSelect;
	private ImageView ivResult;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		init();
	}

	// 初始化控件
	private void init() {
		// TODO Auto-generated method stub
		btnSelect = (Button) findViewById(R.id.btn_select);
		btnSelect.setOnClickListener(this);
		ivResult = (ImageView) findViewById(R.id.iv_result);
	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		switch (v.getId()) {
		case R.id.btn_select:
			Utils.getInstance().selectPicture(this);
			break;

		case R.id.iv_result:
			break;
		}
	}

	@Override
	public void onActivityResult(int requestCode, int resultCode, Intent data) {
		// TODO Auto-generated method stub
		super.onActivityResult(requestCode, resultCode, data);
		if (resultCode != Activity.RESULT_OK) {
			return;
		}
		if (null == data) {
			return;
		}
		Uri uri = null;
		if (requestCode == AppConstant.KITKAT_LESS) {
			uri = data.getData();
			Log.d("tag", "uri=" + uri);
			// 调用裁剪方法
			Utils.getInstance().cropPicture(this, uri);
		} else if (requestCode == AppConstant.KITKAT_ABOVE) {
			uri = data.getData();
			Log.d("tag", "uri=" + uri);
			// 先将这个uri转换为path，然后再转换为uri
			String thePath = Utils.getInstance().getPath(this, uri);
			Utils.getInstance().cropPicture(this,
					Uri.fromFile(new File(thePath)));
		} else if (requestCode == AppConstant.INTENT_CROP) {
			Bitmap bitmap = data.getParcelableExtra("data");
			ivResult.setImageBitmap(bitmap);
			File temp = new File(Environment.getExternalStorageDirectory()
					.getPath() + "/yourAppCacheFolder/");// 自已缓存文件夹
			if (!temp.exists()) {
				temp.mkdir();
			}
			File tempFile = new File(temp.getAbsolutePath()+"/"
					+ Calendar.getInstance().getTimeInMillis() + ".jpg"); // 以时间秒为文件名
			// 图像保存到文件中
			FileOutputStream foutput = null;
			try {
				foutput = new FileOutputStream(tempFile);
				if (bitmap.compress(Bitmap.CompressFormat.JPEG, 100, foutput)) {
					Toast.makeText(MainActivity.this,
							"已生成缓存文件，等待上传！文件位置：" + tempFile.getAbsolutePath(),
							Toast.LENGTH_LONG).show();
				}
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

}</span>

Util代码

一定要注意，获取到的路径转成Uri要用：Uri.fromFile(new File("filePath"))

<span style="font-size:18px;">@SuppressLint("NewApi")
	public String getPath(final Context context, final Uri uri) {

		final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

		// DocumentProvider
		if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
			// ExternalStorageProvider
			if (isExternalStorageDocument(uri)) {
				final String docId = DocumentsContract.getDocumentId(uri);
				final String[] split = docId.split(":");
				final String type = split[0];

				if ("primary".equalsIgnoreCase(type)) {
					return Environment.getExternalStorageDirectory() + "/"
							+ split[1];
				}

				// TODO handle non-primary volumes
			}
			// DownloadsProvider
			else if (isDownloadsDocument(uri)) {
				final String id = DocumentsContract.getDocumentId(uri);
				final Uri contentUri = ContentUris.withAppendedId(
						Uri.parse("content://downloads/public_downloads"),
						Long.valueOf(id));

				return getDataColumn(context, contentUri, null, null);
			}
			// MediaProvider
			else if (isMediaDocument(uri)) {
				final String docId = DocumentsContract.getDocumentId(uri);
				final String[] split = docId.split(":");
				final String type = split[0];

				Uri contentUri = null;
				if ("image".equals(type)) {
					contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
				} else if ("video".equals(type)) {
					contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
				} else if ("audio".equals(type)) {
					contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
				}

				final String selection = "_id=?";
				final String[] selectionArgs = new String[] { split[1] };

				return getDataColumn(context, contentUri, selection,
						selectionArgs);
			}
		}
		// MediaStore (and general)
		else if ("content".equalsIgnoreCase(uri.getScheme())) {

			// Return the remote address
			if (isGooglePhotosUri(uri))
				return uri.getLastPathSegment();

			return getDataColumn(context, uri, null, null);
		}
		// File
		else if ("file".equalsIgnoreCase(uri.getScheme())) {
			return uri.getPath();
		}

		return null;
	}</span>

在onActivityResult里面返回的Uri uri = data.getData();如果是android4.4 uri格式为content://com.android.providers.media.documents/document/image:3952,4.4以下格式为
content://media/external/images/media/3951

另一种方式就是直接设置打开相册的action，
intent.setAction(Intent.ACTION_PICK);
intent.setData(android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
后面的onActivityResult里面就可以不区分4.4版本就可以获取到路径。

完整项目源码下载