Android第二个小练习：拨号提醒

使用触屏手机的人都有过这样的一种错误：在拨号的时候触错了人，一步小心就呼叫出去了，这个时候手忙脚乱的去挂断。那么针对上面的情景设计，我做了这么一个小的练习，就是说当要拨打电话的时候，首先弹出一个对话框，确认要拨打给电话XXX，点确认以后呼叫，点取消以后取消呼叫。
先上图：

因为是一次自学联系，所以功能上并不复杂，但是个人有发现有这样的app在市面上流通，所以做一个对别人有用的练习，还是很有成就感的。下面提出主要的代码

[java]
package abortCall.test;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;

public class AbortCallActivity extends Activity {
    /** Called when the activity is first created. */
    String nums ="";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        try{
            Bundle bundle = this.getIntent().getExtras();
            nums = bundle.getString("num");
            ShowDialog();
        }catch(Exception ex){
        }
    }
    private void ShowDialog(){
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setMessage("您确定要拨号给"+nums+"吗?");
        builder.setTitle("提醒");
        builder.setPositiveButton("确定", new OnClickListener(){
            public void onClick(DialogInterface dialog,int which){
                SharedPreferences settings = getSharedPreferences("SETTING_INFO",0);
                settings.edit().putBoolean("IsAllowed", true).commit();
                Intent intent=new Intent(Intent.ACTION_CALL,Uri.parse("tel:"+nums));
                startActivity(intent);
                Finish();
            }
        });
        builder.setNegativeButton("取消", new OnClickListener(){
            public void onClick(DialogInterface dialog,int which){
                Finish();
            }
        });
        builder.create().show();
    }
    private void Finish(){
        this.finish();
        System.exit(0);
    }
}
package abortCall.test;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;

public class AbortCallActivity extends Activity {
    /** Called when the activity is first created. */
String nums ="";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        try{
        Bundle bundle = this.getIntent().getExtras();
        nums = bundle.getString("num");
        ShowDialog();
        }catch(Exception ex){
        }
    }
    private void ShowDialog(){
  AlertDialog.Builder builder = new AlertDialog.Builder(this);
  builder.setMessage("您确定要拨号给"+nums+"吗?");
  builder.setTitle("提醒");
  builder.setPositiveButton("确定", new OnClickListener(){
   public void onClick(DialogInterface dialog,int which){
    SharedPreferences settings = getSharedPreferences("SETTING_INFO",0);
    settings.edit().putBoolean("IsAllowed", true).commit();
    Intent intent=new Intent(Intent.ACTION_CALL,Uri.parse("tel:"+nums));
    startActivity(intent);
    Finish();
   }
  });
  builder.setNegativeButton("取消", new OnClickListener(){
   public void onClick(DialogInterface dialog,int which){
    Finish();
   }
  });
  builder.create().show();
}
    private void Finish(){
    this.finish();
    System.exit(0);
    }
}

[html]
package abortCall.test;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;

public class callReceiver extends BroadcastReceiver {


    private Context context;
    @Override
    public void onReceive(Context context, Intent intent){
        String action = intent.getAction();
        String PhoneNum = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
        this.context = context;
        SharedPreferences s

补充：移动开发 , Android ,