Android大牛们，帮忙看一下，为什么不能从相册选择图片放入imageview中？

Question

mainActivity:
package com.example.archer.c832_choosepictest;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    private static  final  int TAKE_PHOTO=1;
    private static  final  int CROP_PHOTO=2;

     private Button TakePhoto;
    private ImageView picture;
    private Uri imageUri;
    private Button ChooseFromAlbum;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         picture= (ImageView) findViewById(R.id.picture);
        TakePhoto= (Button) findViewById(R.id.Take_Photo);
        TakePhoto.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //创建File对象，用于存储拍照以后的照片
                File outputImage=new File(Environment.getExternalStorageDirectory(),"output_image.jpg");
                try {
                    if (outputImage.exists()){
                        outputImage.delete();
                    }
                    outputImage.createNewFile();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                imageUri= Uri.fromFile(outputImage);
                Intent intent=new Intent("android.media.action.IMAGE_CAPTURE");
                intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
                //启动相机程序
                startActivityForResult(intent,TAKE_PHOTO);
            }
        });

        ChooseFromAlbum= (Button) findViewById(R.id.choose_from_album);
        ChooseFromAlbum.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
              File outputImage=new File(Environment.getExternalStorageDirectory(),"output_Image.jpg");
                try{
                    if(outputImage.exists()){
                        outputImage.delete();
                    }
                    outputImage.createNewFile();
                } catch (IOException e) {
                    e.printStackTrace();
                }

                imageUri= Uri.fromFile(outputImage);
                Intent intent=new Intent("android.intent.action.GET_CONTENT");
              
                intent.setType("image/*");
                intent.putExtra("crop", true);
                intent.putExtra("scale", true);
                intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
                startActivityForResult(intent,CROP_PHOTO);
            }
        });

  }



    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode){
            case TAKE_PHOTO:
                if (resultCode==RESULT_OK){
                    Intent intent =new Intent("com.android.camera.action.CROP");
                    intent.setDataAndType(imageUri,"image/*");
                    intent.putExtra("scale", true);
                    intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
                    startActivityForResult(intent,CROP_PHOTO);
                }
                break;
            case CROP_PHOTO:
                if(resultCode==RESULT_OK){
                    try{
                        Bitmap bitmap= BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
                         picture.setImageBitmap(bitmap);
                    }catch(FileNotFoundException e){
                        e.printStackTrace();
                    }

                }
                break;
            default:
                break;

        }
    }
}

activity_main:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.archer.c832_choosepictest.MainActivity"
    android:orientation="vertical">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/Take_Photo"
        android:text="@string/Take_Photo"/>


    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/choose_from_album"
        android:text="@string/Choose_From_Album"/>

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/picture"
        android:layout_gravity="center_horizontal"/>


</LinearLayout>

Answer 1

从相册中选取图片，并不会将图片另外存储在你指定的位置，他会返回相册中图片的URI给你。
所以你上面这段代码里面报了异常，文件没找到的异常，不信你单步跟踪一下。

case CROP_PHOTO:
    if(resultCode==RESULT_OK){
        try{
            Bitmap bitmap= BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
             picture.setImageBitmap(bitmap);
        }catch(FileNotFoundException e){
            e.printStackTrace();
        }

    }
    break;

你用下面的方式即可：

ContentResolver resolver = getContentResolver();
Uri originalUri = data.getData();        //获得图片的uri
try {
    Bitmap bm = MediaStore.Images.Media.getBitmap(resolver, originalUri);
    picture.setImageBitmap(bm);
} catch (IOException e) {
    e.printStackTrace();
}

顺便向你推荐一下我写的图片选择的开源库，可以参考一下：PhotoPicker

Answer 2

android-crop-image-when

参考一下你就知道了。

Answer 3

推荐使用第三方库,图片选取的坑太多,有些机型获取不到路径