安卓作业----慕课移动应用开发作业17之通过BroadcastReceiver模拟手机电量查看

Stella ·

更新时间:2024-11-10

· 763 次阅读

本篇通过BroadcastReceiver模拟手机电量查看，通过AlertDialog进行电量信息提示

同时这也是中国大学慕课移动终端应用开发的网课作业17，我会持续更新我的作业，如果有需要关注一下吧

学习建议

1.Broadcast有关知识可看：Android 之超详细 Broadcast

2.了解Intent.ACTION_BATTERY_CHANGED中携带数据可看：监听电池变化的广播中携带的数据

3.常用Intent可看：android 系统Intent合集

效果图

在这里插入图片描述

代码实现 MyReceiver.java

public class MyReceiver extends BroadcastReceiver {
    private int level;//保存电量的值
    @Override
    public void onReceive(Context context, Intent intent) {
        //获取电量信息并保存
        int level = intent.getIntExtra("level", 0);
        this.level = level;
    }
    public int getLevel() {
        return level;
    }
    public void setLevel(int level) {
        this.level = level;
    }
}

MainActivity.java

public class MainActivity extends AppCompatActivity {
    private Button mButton;
    private MyReceiver mReceiver;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mButton = findViewById(R.id.send);
        //设置过滤器
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
        mReceiver = new MyReceiver();
        //动态注册
        registerReceiver(mReceiver, intentFilter);
        //给按钮添加弹出对话框事件
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder d = new AlertDialog.Builder(MainActivity.this);
                d.setTitle("系统提示")
                        .setMessage("当前剩余电量低于"+mReceiver.getLevel()+"%,请及时充电")//获取电量这个属性
                        .setIcon(R.mipmap.ic_launcher)
                        .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                Toast.makeText(MainActivity.this,"点击了确定",Toast.LENGTH_SHORT).show();
                            }
                        })
                        .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                Toast.makeText(MainActivity.this,"点击了取消",Toast.LENGTH_SHORT).show();
                            }
                        })
                        .setNeutralButton("忽略", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                Toast.makeText(MainActivity.this,"点击了忽略",Toast.LENGTH_SHORT).show();
                            }
                        });
                d.create().show();
            }
        });
    }
}

activity_main.xml