Android 电池电量 新手练手

package xyz.Hello; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.widget.CompoundButton; import android.widget.ToggleButton; import android.widget.CompoundButton.OnCheckedChangeListener; public class HelloWorldActivity extends Activity { /** Called when the activity is first created. */ private ToggleButton BatteryCheck; private TextView TextShow; private Button Button_Inf; private BatteryListener BatteryListener; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button_Inf = (Button)findViewById(R.id.button_Inf); BatteryCheck = (ToggleButton)findViewById(R.id.batteryCheck); TextShow = (TextView)findViewById(R.id.textShow); BatteryListener = new BatteryListener(); Button_Inf.setOnClickListener(new OnClickListener(){ @Override public void onClick(View x) { Button_Inf.setText("By 蓝海哨兵"); } }); BatteryCheck.setOnCheckedChangeListener(new OnCheckedChangeListener() { //@Override public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) { if(isChecked) { IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED); registerReceiver(BatteryListener,filter); } else { unregisterReceiver(BatteryListener); TextShow.setText("谢谢使用"); } } }); } private class BatteryListener extends BroadcastReceiver { @Override public void onReceive(Context context,Intent intent){ int current = intent.getExtras().getInt("level"); int totle = intent.getExtras().getInt("scale"); int percent = current*100/totle; TextShow.setText("电量剩余"+percent+"%"); } } }