2. 外部類作爲事件監聽器。創建一個項目，界面中包含2個EditText和1個按鈕，用戶點擊按鈕時顯示提示信息：短信發送完成，可參考下圖所示。要求：使用外部類作爲監聽器。

外部類作爲事件監聽器。創建一個項目，界面中包含2個EditText和1個按鈕，用戶點擊按鈕時顯示提示信息：短信發送完成，可參考下圖所示。要求：使用外部類作爲監聽器。

java代碼

import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends AppCompatActivity {
    private  Button bt_submit;
    private EditText et_content;
    private EditText et_number;
    private Context ctx;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        ctx=this;
        initUi();
        initData();
    }
    private void initData() {
        bt_submit.setOnClickListener(new SendSmsListener(this,et_number,et_content){});
    }

    private void initUi() {
        bt_submit = findViewById(R.id.bt_submit);
        et_content = findViewById(R.id.et_content);
        et_number = findViewById(R.id.et_number);
        new Thread(){
            @RequiresApi(api = Build.VERSION_CODES.M)
            @Override
            public void run() {
                if (getApplicationContext().checkSelfPermission( Manifest.permission.SEND_SMS) != PackageManager.PERMISSION_GRANTED
                ){
                    ActivityCompat.requestPermissions((Activity) ctx, new String[]{Manifest.permission.SEND_SMS}, 1);
                }
            }
        }.start();
    }

}

public class SendSmsListener implements View.OnClickListener {
    private Activity mainActivity;
    private EditText et_number;
    private EditText et_content;

    public SendSmsListener(MainActivity mainActivity, EditText et_number, EditText et_content) {
        this.mainActivity = mainActivity;
        this.et_number = et_number;
        this.et_content = et_content;
    }

    @Override
    public void onClick(View v) {
        String number= et_number.getText().toString();
        String content= et_content.getText().toString();
        SmsManager smsManager= SmsManager.getDefault();
        PendingIntent pi = PendingIntent.getBroadcast(mainActivity, 0, new Intent(), 0);
        smsManager.sendTextMessage(number,null,content,pi,null);
        Toast.makeText(mainActivity, "短信發送完成", Toast.LENGTH_LONG).show();

    }
}

XML佈局文件

<LinearLayout
    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:orientation="vertical"
    android:padding="10dp"
    tools:context=".MainActivity">

    <EditText
        android:id="@+id/et_number"
        android:hint="請填寫收信號碼"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text=""
        android:textSize="16sp"
        />
    <EditText
        android:id="@+id/et_content"
        android:hint="請填寫短信內容"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text=""
        android:textSize="16sp"
        />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="發送"
        android:id="@+id/bt_submit"/>
</LinearLayout>