024_Android ContentResolver读取短信并自动填充

SMSContent类

import android.content.Context;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Handler;
import android.widget.TextView;

public class SMSContent extends ContentObserver {
    //上下文
    private Context context;
    //被填充的textView
    private TextView textView;

    public SMSContent(Handler handler, Context context, TextView textView) {
        super(handler);
        this.context = context;
        this.textView = textView;
    }

    //重写onChange方法
    @Override
    public void onChange(boolean selfChange) {
        super.onChange(selfChange);
        /***
         * 查询短信的数据库并排序
         * _id id
         * address 发信人
         * body 信息内容
         */
        Cursor cursor = context.getContentResolver().query(Uri.parse("content://sms/inbox"),
                new String[]{"_id", "address", "body"},
                null, null, "_id desc");
        if (cursor != null && cursor.getCount() > 0) {
            //获得第一条短信的信息
            cursor.moveToFirst();
            String body = cursor.getString(cursor.getColumnIndex("body"));
            //设置给textView
            textView.setText(body);
        }
    }
}

MainActivity类

import android.Manifest;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

public class MainActivity extends AppCompatActivity {

    private TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化控件
        textView = findViewById(R.id.textView);
        //获取权限
        getAccess(Manifest.permission.READ_SMS);
        //注册监听
        SMSContent smsContent = new SMSContent(new Handler(), this, textView);
        this.getContentResolver().registerContentObserver(Uri.parse("content://sms"), true, smsContent);
    }

    private void getAccess(String permission) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M)
            return;
        if (ContextCompat.checkSelfPermission(getApplication(), permission) == PackageManager.PERMISSION_GRANTED)
            return;
        ActivityCompat.requestPermissions(this, new String[]{permission}, 1);
    }
}