Android实战简易教程-第二十八枪(Uri转String型实例)

Posted zhchoutai

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接上一篇文章。我们能够轻易的获取所选图片的uri,那么我们考虑怎样将获取的uri转换成String型的地址呢?

接下来我们通过实例来研究。布局文件和上篇(二十七枪)一致,我们就不再列出,直接看MainActivity.java:

package com.example.userphoto;

import java.io.File;

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import cn.bmob.v3.Bmob;
import cn.bmob.v3.datatype.BmobFile;
import cn.bmob.v3.listener.UploadFileListener;

public class MainActivity extends Activity implements OnClickListener {
	private static final int IMAGE_REQUEST_CODE = 0;
	private static final int CAMERA_REQUEST_CODE = 1;
	private static final int RESIZE_REQUEST_CODE = 2;

	private static final String IMAGE_FILE_NAME = "header.jpg";

	private ImageView mImageHeader;

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

		Bmob.initialize(this, "8f3ffb2658d8a3366a70a0b0ca0b71b2");//初始化Bmob
		setupViews();
	}

	private void setupViews() {
		mImageHeader = (ImageView) findViewById(R.id.image_header);
		final Button selectBtn1 = (Button) findViewById(R.id.btn_selectimage);
		final Button selectBtn2 = (Button) findViewById(R.id.btn_takephoto);
		selectBtn1.setOnClickListener(this);
		selectBtn2.setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.btn_selectimage:
			Intent galleryIntent = new Intent(Intent.ACTION_GET_CONTENT);
			galleryIntent.addCategory(Intent.CATEGORY_OPENABLE);
			galleryIntent.setType("image/*");//图片
			startActivityForResult(galleryIntent, IMAGE_REQUEST_CODE);
			break;
		case R.id.btn_takephoto:
			if (isSdcardExisting()) {
				Intent cameraIntent = new Intent(
						"android.media.action.IMAGE_CAPTURE");//拍照
				cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, getImageUri());
				cameraIntent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0);
				startActivityForResult(cameraIntent, CAMERA_REQUEST_CODE);
			} else {
				Toast.makeText(v.getContext(), "请插入sd卡", Toast.LENGTH_LONG)
						.show();
			}
			break;
		}
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		if (resultCode != RESULT_OK) {
			return;
		} else {
			switch (requestCode) {
			case IMAGE_REQUEST_CODE:
				Uri originalUri=data.getData();//获取图片uri
				resizeImage(originalUri);
				//以下方法将获取的uri转为String类型哦!
				String []imgs={MediaStore.Images.Media.DATA};//将图片URI转换成存储路径  
				Cursor cursor=this.managedQuery(originalUri, imgs, null, null, null);  
				int index=cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);  
				cursor.moveToFirst();  
				String img_url=cursor.getString(index);  
				showToast(img_url);
				break;
			case CAMERA_REQUEST_CODE:
				if (isSdcardExisting()) {
					resizeImage(getImageUri());
					
					/*// 上传图片
					String imgpath = getImageUri();
					final BmobFile icon = new BmobFile(new File(imgpath));
					icon.upload(this, new UploadFileListener() {
						
						@Override
						public void onSuccess() {
							// TODO Auto-generated method stub
							Person person = new Person();
							person.setIcon(icon);
							person.save(MainActivity.this);
							showToast("图片上传成功");
						}
						
						@Override
						public void onProgress(Integer arg0) {
							// TODO Auto-generated method stub
							
						}
						
						@Override
						public void onFailure(int arg0, String arg1) {
							// TODO Auto-generated method stub
							showToast("图片上传失败:"+arg1);
						}
					});*/
				} else {
					Toast.makeText(MainActivity.this, "未找到存储卡,无法存储照片!

", Toast.LENGTH_LONG).show(); } break; case RESIZE_REQUEST_CODE: if (data != null) { showResizeImage(data); } break; } } super.onActivityResult(requestCode, resultCode, data); } private void showToast(String msg){ Toast.makeText(this, msg, Toast.LENGTH_SHORT).show(); } private boolean isSdcardExisting() {//推断SD卡是否存在 final String state = Environment.getExternalStorageState(); if (state.equals(Environment.MEDIA_MOUNTED)) { return true; } else { return false; } } public void resizeImage(Uri uri) {//重塑图片大小 Intent intent = new Intent("com.android.camera.action.CROP"); intent.setDataAndType(uri, "image/*"); intent.putExtra("crop", "true");//能够裁剪 intent.putExtra("aspectX", 1); intent.putExtra("aspectY", 1); intent.putExtra("outputX", 150); intent.putExtra("outputY", 150); intent.putExtra("return-data", true); startActivityForResult(intent, RESIZE_REQUEST_CODE); } private void showResizeImage(Intent data) {//显示图片 Bundle extras = data.getExtras(); if (extras != null) { Bitmap photo = extras.getParcelable("data"); Drawable drawable = new BitmapDrawable(photo); mImageHeader.setImageDrawable(drawable); } } private Uri getImageUri() {//获取路径 return Uri.fromFile(new File(Environment.getExternalStorageDirectory(), IMAGE_FILE_NAME)); } }


将方法单列出来即:

                                Uri originalUri=data.getData();//获取图片uri
				resizeImage(originalUri);
				//以下方法将获取的uri转为String类型哦!
				String []imgs={MediaStore.Images.Media.DATA};//将图片URI转换成存储路径  
				Cursor cursor=this.managedQuery(originalUri, imgs, null, null, null);  
				int index=cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);  
				cursor.moveToFirst();  
				String img_url=cursor.getString(index);  
				showToast(img_url);

执行实例会出现例如以下错误:

技术分享

不懂英文的也大概能看懂,提示权限不足,我们加入例如以下权限:

技术分享

执行实例,顺利通过:

技术分享

Toast中显示出了图片的路径,话说获取这路径有什么用?请看下篇文章(二十九枪)。



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