android ContentObserver实时监测媒体图片增删改,java（1）

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_MEDIA_IMAGES" />

    implementation 'com.github.bumptech.glide:glide:4.15.0'
    annotationProcessor 'com.github.bumptech.glide:compiler:4.15.0'
    
    implementation "androidx.documentfile:documentfile:1.0.1"

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.documentfile.provider.DocumentFile;

import android.content.Context;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;

import com.bumptech.glide.Glide;

import java.util.Collection;

public class MainActivity extends AppCompatActivity {
    private String TAG = "fly";
    private ImageView image;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        image = findViewById(R.id.image);
        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                dataChanged();
            }
        });

        readAllPhoto();

        Log.d(TAG, "-----" + Thread.currentThread().getId());

        Handler handler = new Handler(Looper.getMainLooper()) {
            @Override
            public void handleMessage(@NonNull Message msg) {
                super.handleMessage(msg);
                Log.d(TAG, msg.toString());
            }
        };

        MyContentObserver contentObserver = new MyContentObserver(handler);
        getContentResolver().registerContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, true, contentObserver);
    }

    private class MyContentObserver extends ContentObserver {
        public MyContentObserver(Handler handler) {
            super(handler);
        }

        @Override
        public void onChange(boolean selfChange, @Nullable Uri uri) {
            super.onChange(selfChange, uri);
            Log.d(TAG, "tid: " + Thread.currentThread().getId());
            Log.d(TAG, "onChange " + uri.toString());
            Glide.with(getApplicationContext()).load(uri).into(image);
            Log.d(TAG, DocumentFile.fromSingleUri(getApplicationContext(), uri).getName());
            Log.d(TAG, getPathFromUri(getApplicationContext(), uri));
        }

        @Override
        public void onChange(boolean selfChange, @NonNull Collection<Uri> uris, int flags) {
            super.onChange(selfChange, uris, flags);
            Log.d(TAG, "onChange Size:" + uris.size());
        }
    }

    private String getPathFromUri(Context context, Uri contentUri) {
        Cursor cursor = null;
        try {
            String[] proj = {MediaStore.Images.Media.DATA};
            cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
            cursor.moveToFirst();
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            return cursor.getString(column_index);
        } finally {
            if (cursor != null) {
                cursor.close();
            }
        }
    }

    private void readAllPhoto() {
        Cursor cursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null, null);
        while (cursor.moveToNext()) {
            //图片名称
            String name = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DISPLAY_NAME));

            // 图片绝对路径
            int data_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            String path = cursor.getString(data_index);
            Log.d(TAG, "name= " + name + "  path= " + path);
        }

        cursor.close();
    }

    private void dataChanged() {
        Log.d(TAG, "dataChanged");
        this.getContentResolver().notifyChange(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null);
    }
}

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