Android 从相册选取照片_android 选择图库里面的照片-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_43323172/article/details/114920652

本文介绍了一个简单的Android应用，该应用允许用户从设备中选择一张照片并将其显示在一个ImageView组件中。通过使用ACTION_PICK Intent和MediaStore API，该应用能够获取用户选择的照片路径，并使用BitmapFactory进行解码。

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在这里插入图片描述


import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

public class ChoosePhotoActivity extends AppCompatActivity implements View.OnClickListener {

    private Button btnChoosephoto;
    private ImageView ivPhoto;

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

        btnChoosephoto = (Button) findViewById(R.id.btn_choosephoto);
        ivPhoto = (ImageView) findViewById(R.id.iv_photo);

        btnChoosephoto.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if(v.getId() == R.id.btn_choosephoto) {
            if(ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
            } else {
                choosePhoto();
            }
        }
    }

    private void choosePhoto() {
        Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(intent, 1);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch(requestCode) {
            case 1:
                if(resultCode == RESULT_OK) {
                    Uri photoUri = data.getData();
                    Cursor cursor = getContentResolver().query(photoUri, new String[] {MediaStore.Images.Media.DATA}, null, null, null);
                    cursor.moveToFirst();
                    String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
                    ivPhoto.setImageBitmap(BitmapFactory.decodeFile(path));
                }
                break;
            default:
                break;
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            choosePhoto();
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".ChoosePhotoActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/btn_choosephoto"
        android:text="选择照片"
        android:textSize="17sp"
        android:layout_gravity="center_horizontal" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/iv_photo" />
</LinearLayout>