使用handler更新dialog显示

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handler更新dialog显示

通过handler结合Html刷新dialog界面的显示内容：

package com.pro.activity;

import java.util.List;

import com.pro.R;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;
import android.preference.PreferenceScreen;
import android.text.Html;
import android.text.Spanned;
import android.util.Log;
import android.view.ViewGroup.LayoutParams;
import android.widget.TextView;

public class SensorCheckActivity extends PreferenceActivity implements OnSharedPreferenceChangeListener,SensorEventListener{

private SharedPreferences sp;
private SensorManager sManager;
private Sensor sensor;
private Spanned msgMes;
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
 // TODO Auto-generated method stub
 super.onCreate(savedInstanceState);
 addPreferencesFromResource(R.xml.sensor);
 sp = PreferenceManager.getDefaultSharedPreferences(this);
 sManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
// sensor = sManager.getDefaultSensor(Sensor.TYPE_ALL);

}
private Handler handler = new Handler(){
 public void handleMessage(android.os.Message msg) {
 switch (msg.what) {
 case Sensor.TYPE_ACCELEROMETER:
 float[] data = (float[]) msg.obj;
// msgMes = "X轴方向:"+data[0]+"\nY周方向:"+data[1]+"\nZ轴方向:"+data[2];
 msgMes = Html.fromHtml("    X轴方向加速度:"+data[0]+"    Y周方向加速度:"+data[1]+"    Z轴方向加速度:"+data[2]+" ");
 textView.setText(msgMes);
 break;
 case Sensor.TYPE_LIGHT:
 float[] light = (float[]) msg.obj;
 msgMes = Html.fromHtml("    当前光线强度:"+light[0]+" ");
 textView.setText(msgMes);
 break;
 case Sensor.TYPE_MAGNETIC_FIELD:
 float[] magnetic = (float[]) msg.obj;
 msgMes = Html.fromHtml("    X轴方向磁感应:"+magnetic[0]+"    Y周方向磁感应:"+magnetic[1]+"    Z轴方向磁感应:"+magnetic[2]+" ");
 textView.setText(msgMes);
 break;
 case Sensor.TYPE_PROXIMITY:
 float[] proximity = (float[]) msg.obj;
 msgMes = Html.fromHtml("    当前近距感应值:"+proximity[0]+" ");
 textView.setText(msgMes);
 break;
 case Sensor.TYPE_ORIENTATION:
 float[] orientation = (float[]) msg.obj;
 msgMes = Html.fromHtml("    X轴方向:"+orientation[0]+"    Y周方向:"+orientation[1]+"    Z轴方向:"+orientation[2]+" ");
 textView.setText(msgMes);
 break;
 case Sensor.TYPE_PRESSURE:
 float[] pressure = (float[]) msg.obj;
 msgMes = Html.fromHtml("    当前压力感应值:"+pressure[0]+" ");
 textView.setText(msgMes);
 break;
 case Sensor.TYPE_TEMPERATURE:
 float[] temperaure = (float[]) msg.obj;
 msgMes = Html.fromHtml("    当前温度感应值:"+temperaure[0]+" ");
 textView.setText(msgMes);
 break;

   default:
    break;
   }
  };
};
@Override
protected void onResume() {
  // TODO Auto-generated method stub
  super.onResume();
  sp.registerOnSharedPreferenceChangeListener(this);
//  sManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_NORMAL);

}
@Override
protected void onStop() {
  // TODO Auto-generated method stub
  super.onStop();
  sp.unregisterOnSharedPreferenceChangeListener(this);
}
@Override
protected void onDestroy() {
  // TODO Auto-generated method stub
  super.onDestroy();
//  sManager.unregisterListener(this);
}
@Override
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
   String key) {
  // TODO Auto-generated method stub

}
@Override
public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen,
   Preference preference) {
  if("key_acceleration".equals(preference.getKey())){//加速度
   showDialogView(this, Sensor.TYPE_ACCELEROMETER, (String) preference.getTitle());
  }else if("key_ray".equals(preference.getKey())){//光线
   showDialogView(this, Sensor.TYPE_LIGHT, (String) preference.getTitle());
  }else if("key_dis".equals(preference.getKey())){//近距
   showDialogView(this, Sensor.TYPE_PROXIMITY, (String) preference.getTitle());
  }else if("key_temperature".equals(preference.getKey())){//温度
   showDialogView(this, Sensor.TYPE_TEMPERATURE, (String) preference.getTitle());
  }else if("key_way".equals(preference.getKey())){//方向
   showDialogView(this, Sensor.TYPE_ORIENTATION, (String) preference.getTitle());
  }else if ("key_magnetic".equals(preference.getKey())) {//磁场
   showDialogView(this, Sensor.TYPE_MAGNETIC_FIELD, (String) preference.getTitle());
  }else if("key_pressure".equals(preference.getKey())){//压力
   showDialogView(this, Sensor.TYPE_PRESSURE, (String) preference.getTitle());
  }
  return super.onPreferenceTreeClick(preferenceScreen, preference);
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
  // TODO Auto-generated method stub

}
@Override
public void onSensorChanged(SensorEvent event) {
  int type = event.sensor.getType();//.accuracy;
  Message message = new Message();
  switch (type) {
  case Sensor.TYPE_ACCELEROMETER://SensorManager.SENSOR_ACCELEROMETER://加速度
   float[] data = new float[3];
   data[0] = event.values[0]; //x
   data[1] = event.values[1]; //y
   data[2] = event.values[2]; //z轴上的加速度
   message.what = type;
   message.obj = data;
   handler.sendMessage(message);
   break;
  case Sensor.TYPE_ORIENTATION://SensorManager.SENSOR_ORIENTATION://方向
   float[] orientation = new float[3];
   orientation[0] = event.values[0]; //x
   orientation[1] = event.values[1]; //y
   orientation[2] = event.values[2]; //z轴上的方向
   message.what = type;
   message.obj = orientation;
   handler.sendMessage(message);
   break;
  case Sensor.TYPE_PROXIMITY://SensorManager.SENSOR_PROXIMITY://距离
   float[] proximity = new float[1];
   proximity[0] = event.values[0]; //
   message.what = type;
   message.obj = proximity;
   handler.sendMessage(message);
   break;
  case Sensor.TYPE_PRESSURE://Sensor.TYPE_PRESSURE://压力
   float[] pressure = new float[1];
   pressure[0] = event.values[0]; //
   message.what = type;
   message.obj = pressure;
   handler.sendMessage(message);
   break;
  case Sensor.TYPE_LIGHT://SensorManager.SENSOR_LIGHT://光线
   float[] light = new float[1];
   light[0] = event.values[0]; //
   message.what = type;
   message.obj = light;
   handler.sendMessage(message);
   break;
  case Sensor.TYPE_TEMPERATURE://SensorManager.SENSOR_TEMPERATURE://温度
   float[] temperature = new float[1];
   temperature[0] = event.values[0]; //
   message.what = type;
   message.obj = temperature;
   handler.sendMessage(message);
   break;
  case Sensor.TYPE_MAGNETIC_FIELD://磁场
   float[] magnetic = new float[3];
   magnetic[0] = event.values[0]; //x
   magnetic[1] = event.values[1]; //y
   magnetic[2] = event.values[2]; //z轴上的磁感应
   message.what = type;
   message.obj = magnetic;
   handler.sendMessage(message);
   break;

default:
 break;
 }
}
/**
* 显示不同感应器的测试视图
*/
private void showDialogView(Context ctx,int sensorType,String msgTitle){
 AlertDialog.Builder builder = new AlertDialog.Builder(ctx);
 if(sManager != null){
// sensor = sManager.getDefaultSensor(Sensor.TYPE_ALL);
 sensor = sManager.getDefaultSensor(sensorType);
 if(sensor != null){

 sManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_NORMAL);
 }else{//手机不支持此类感应器类型
 msgMes = Html.fromHtml("   该手机不支持此类感应器类型");
 builder.setMessage(msgMes);
 }
 }
 textView = new TextView(ctx);
 LayoutParams lp = new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT);
 textView.setLayoutParams(lp);

 builder.setTitle(msgTitle);
 builder.setIcon(R.drawable.icon);
// builder.setMessage(msgMes);
 builder.setView(textView);
 builder.setNegativeButton("确定", new DialogInterface.OnClickListener() {

 @Override
 public void onClick(DialogInterface dialog, int which) {
 sManager.unregisterListener(SensorCheckActivity.this);
 }
 });
 builder.show()
 .setOnShowListener(new DialogInterface.OnShowListener() {

 @Override
 public void onShow(DialogInterface dialog) {
 textView.setText(msgMes);
 }
 });

}
}