Android实现短信验证码自动拦截读取功能

知识准备：
 1.观察者模式的理解【文章稍后来到~~】
 2.Android的Cursor使用【Android基础】
 3.正则表达式使用【Java基础】
 4.Handler使用【Android基础】

代码整理：

MainActivity.java

import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

public static final int MSG_RECEIVER_CODE = 1;
private EditText smsEt;
private Handler handler = new Handler() {
  @Override
  public void handleMessage(Message msg) {
    switch (msg.what) {
      case MSG_RECEIVER_CODE:
        String message= (String) msg.obj;
        smsEt.setText(message);
        smsEt.setSelection(message.length());
        break;
      default:
        break;
    }
  }
};
private MySmsObserver mySmsObserver;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  smsEt = (EditText) findViewById(R.id.smsEt);
  mySmsObserver = new MySmsObserver(this, handler);
  Uri uri=Uri.parse("content://sms");
  getContentResolver().registerContentObserver(uri,true, mySmsObserver);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
  getMenuInflater().inflate(R.menu.menu_main, menu);
  return true;
}

@Override
protected void onDestroy() {
  super.onDestroy();
  getContentResolver().unregisterContentObserver(mySmsObserver);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
  int id = item.getItemId();

  if (id == R.id.action_settings) {
    return true;
  }

  return super.onOptionsItemSelected(item);
}
}

MySmsObserver.java

import android.content.Context;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Handler;
import android.util.Log;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
* Created by Nate on 2015/9/28.
*/
public class MySmsObserver extends ContentObserver {

private Context mContext;
private Handler mHandler;

public MySmsObserver(Context context, Handler handler) {
  super(handler);
  this.mContext = context;
  this.mHandler = handler;
}

@Override
public void onChange(boolean selfChange, Uri uri) {
  super.onChange(selfChange, uri);

  if (uri.toString().equals("content://sms/raw")) {
    return;
  }

  Uri queryUri = Uri.parse("content://sms/inbox");
  String code = "";
  Cursor cursor = mContext.getContentResolver().query(queryUri, null, null, null, "date desc");
  if (cursor != null) {
    if (cursor.moveToFirst()) {
      String address = cursor.getString(cursor.getColumnIndex("address"));
      String message = cursor.getString(cursor.getColumnIndex("body"));

      // TODO: 2015/9/28 这里可以根据address做一些自己的判断，比如只有特定的手机号才做判断

      Log.e("guxuewu", "address:==>" + address + " message:==>" + message);

      // TODO: 2015/9/28 这里可以根据自己的项目进行特定的正则表达式的编写
      Pattern pattern = Pattern.compile("(\\d{6})");
      Matcher matcher = pattern.matcher(message);

      if (matcher.find()) {
        code = matcher.group(0);
        mHandler.obtainMessage(MainActivity.MSG_RECEIVER_CODE, code).sendToTarget();
      }
    }

    cursor.close();
  }

}
}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity">

<EditText
  android:id="@+id/smsEt"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_centerHorizontal="true"
  android:ems="10" />

</RelativeLayout>

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