如何访问手机相册中的图片? [英] How to access an image from the phone's photo gallery?

问题描述

有没有人知道如何访问手机的照片库?我正在制作一个拍摄植物叶子照片的应用程序分析图像以确定它是否确定.我们希望我们可以为用户提供两种选择:拍摄叶子的照片或使用树叶的图像用户已经采取的叶子.然而，我们得到了参与的图片，但我们没有知道如何访问照片库.

By any chance, does anyone know how to access the phone's photo gallery? I am making an application that takes a picture of a plant leaf and analyzes the image to determine whether or not it is determine. We were hoping that we could give the user two options of taking the picture of the leaf or using an image of a leaf that the user has already taken. However, we got the picture taking part, but we do not know how to access the photo gallery.

推荐答案

您必须使用内置的 Intents 启动 Gallery App.之后，在您的 onActivityResult() 上，获取所选图像的路径并将图像加载到您的 ImageView

You have to launch the Gallery App using the built-in Intents. After that, on your onActivityResult(), get the path of the selected image and load your image into your ImageView

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 >
<TextView
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:text="@string/hello"
 />
<Button
 android:id="@+id/loadimage"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:text="Load Image"
 />
<TextView
 android:id="@+id/targeturi"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 />
<ImageView
 android:id="@+id/targetimage"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 />
</LinearLayout>

您的活动

 package com.exercise.AndroidSelectImage;

    import java.io.FileNotFoundException;

    import android.app.Activity;
    import android.content.Intent;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.net.Uri;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.ImageView;
    import android.widget.TextView;

    public class AndroidSelectImage extends Activity {

    TextView textTargetUri;
    ImageView targetImage;

     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         Button buttonLoadImage = (Button)findViewById(R.id.loadimage);
         textTargetUri = (TextView)findViewById(R.id.targeturi);
         targetImage = (ImageView)findViewById(R.id.targetimage);

         buttonLoadImage.setOnClickListener(new Button.OnClickListener(){

     @Override
     public void onClick(View arg0) {
      // TODO Auto-generated method stub
      Intent intent = new Intent(Intent.ACTION_PICK,
        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
      startActivityForResult(intent, 0);
     }});
     }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // TODO Auto-generated method stub
    super.onActivityResult(requestCode, resultCode, data);

    if (resultCode == RESULT_OK){
     Uri targetUri = data.getData();
     textTargetUri.setText(targetUri.toString());
     Bitmap bitmap;
     try {
      bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(targetUri));
      targetImage.setImageBitmap(bitmap);
     } catch (FileNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
    }
    }
    }

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