Android实战简易教程-第二十八枪（Uri转String型实例）

恢弘志士之气，不宜妄自菲薄。这篇文章主要讲述Android实战简易教程-第二十八枪（Uri转String型实例）相关的知识，希望能为你提供帮助。
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：