Android--从本地相册获取图片并显示

短命女 2022-05-15 08:23 684阅读 0赞

## Android--从本地相册获取图片并显示 ##

很多博客讲这部分内容会和其他的混在一起讲，看起来会比较费劲，为了更方便的调用，特意写了如何从本地获取图片以及 显示这部分代码。

1、布局文件：

<?xml version="1.0" encoding="utf-8"?>
    <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="com.example.choose_photo.MainActivity">
    
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="choose"
            android:id="@+id/choose"/>
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/imageview"/>
    
    </android.support.constraint.ConstraintLayout>

2、Maintivity

package com.example.choose_photo;
    
    import android.content.Intent;
    import android.graphics.Bitmap;
    import android.net.Uri;
    import android.provider.MediaStore;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.ImageView;
    
    import java.io.IOException;
    
    public class MainActivity extends AppCompatActivity {
        private Button button;
        private ImageView imageView;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            button = (Button) findViewById(R.id.choose);
            imageView = (ImageView) findViewById(R.id.imageview);
            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Intent intent = new Intent(Intent.ACTION_PICK, null);
                    intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
                    startActivityForResult(intent, 2);
    
    
                }
            });
        }
        protected void onActivityResult(int requestCode, int resultCode, Intent data){
            if (requestCode == 2) {
                // 从相册返回的数据
                if (data != null) {
                    // 得到图片的全路径
                    Uri uri = data.getData();
                    imageView.setImageURI(uri);
              }
            }
        }
    
    }

3、权限

<uses-feature
            android:name="android.hardware.camera"
            android:required="true"
            />
    
        <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
        <uses-permission android:name="android.permission.CAMERA"/>
        <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
        <uses-permission android:name="com.miui.whetstone.permission.ACCESS_PROVIDER"/>
        <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
        <uses-feature android:name="android.hardware.camera.autofocus" />

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[70]: /images/20220515/7d7e6e58bb044a989e226f3f62c9c99a.png
[70 1]: /images/20220515/54832eff83184664b38076095b360368.png
[70 2]: /images/20220515/f2d4aeadcab54d1dba6d7cc90ead8a7d.png