使用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);
   }
  });
  
 }
}