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我想從加速度計獲取數據後將數據推送到服務器。申請表示：不幸停止。 （從谷歌添加JsonObject）
在這我從谷歌使用JsonObject。
這個對象似乎有問題。只要我從這裏實例化一個對象，我的應用程序就會拋出一個錯誤：不幸的是，appname已經停止。
我的MainActivity代碼：。
package com.example.accelerometerdemo;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.google.gson.JsonIOException;
import com.google.gson.JsonObject;
public class MainActivity extends Activity implements SensorEventListener {
private static final String MSG_TAG_1 = "MainActivity";
private static final String MSG_TAG_2 = "place_holder";
private SensorManager mSensorManager;
private Sensor mAccelerometer;
TextView title,tv,tv1,tv2, test;
RelativeLayout layout;
int i = 0;
//For preparing file
String[] paramName = { "device_id", "timestamp", "sensor_type",
"sensor_value" };
String URLStr = "http://209.129.244.7/sensors";
java.util.Date date = new java.util.Date();
@Override
public final void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); //refer layout file code below
//get the sensor service
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
//get the accelerometer sensor
mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
//If sensor not available
if (mAccelerometer == null){
System.out.println("no temperature sensor");
}
//get layout
layout = (RelativeLayout)findViewById(R.id.relative);
//get textviews
title=(TextView)findViewById(R.id.name);
tv=(TextView)findViewById(R.id.xval);
tv1=(TextView)findViewById(R.id.yval);
tv2=(TextView)findViewById(R.id.zval);
test = (TextView)findViewById(R.id.testval);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public final void onAccuracyChanged(Sensor sensor, int accuracy)
{
// Do something here if sensor accuracy changes.
}
@Override
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
i++;
if (i < 5) {
getAccelerometer(event);
} else {
onPause();
}
}
}
public final void getAccelerometer(SensorEvent event)
{
// Many sensors return 3 values, one for each axis.
float x = event.values[0];
float y = event.values[1];
float z = event.values[2];
String t = "This is a test value";
//display values using TextView
title.setText(R.string.app_name);
tv.setText("X axis" +"\t\t"+x);
tv1.setText("Y axis" + "\t\t" +y);
tv2.setText("Z axis" +"\t\t" +z);
test.setText("Testing" +"\t\t" +event.values[2]);
JsonObject jo = new JsonObject();
try {
//formatting the file
jsonObject_x.put("sensor_value", 78);
jo.addProperty("device_id", "nexus_test_dev"); //Long type
jo.addProperty("timestamp", date.getTime()); //Long type
jo.addProperty("sensor_type", "Accelerometer_x"); //String type
jo.addProperty("sensor_value", 78); //Double type
//String[] paramName = { "device_id", "timestamp", "sensor_type", "sensor_value" };
//{"device_id":"test", "timestamp": 1373566899100, "temp": 123}
String[] paramVal = { "aeron_test_p", String.valueOf(date.getTime()),
"temp", "121" };
//Displaying readings in LOGCAT
for(String s : paramVal){
Log.d(MSG_TAG_1, s);
}
try {
httpPostSensorReading(URLStr, jo.toString());
Log.d(MSG_TAG_2, "Test");
} catch (Exception e) {e.printStackTrace();
}
} catch (JsonIOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static String httpPostSensorReading(String urlStr, String jsonString) throws Exception {
URL url = new URL(urlStr);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/json");
conn.setRequestProperty("Accept", "application/json");
conn.setDoOutput(true);
// Create the form content
OutputStream out = conn.getOutputStream();
Writer writer = new OutputStreamWriter(out, "UTF-8");
writer.write(jsonString);
writer.close();
out.close();
if (conn.getResponseCode() != 200) {
throw new IOException(conn.getResponseMessage());
}
// Buffer the result into a string
BufferedReader rd = new BufferedReader(new InputStreamReader(
conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line;
while ((line = rd.readLine()) != null) {
sb.append(line);
}
rd.close();
conn.disconnect();
return sb.toString();
}
@Override
protected void onResume()
{
super.onResume();
mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
protected void onPause()
{
super.onPause();
mSensorManager.unregisterListener(this);
}
}
的那一刻我添加此
JsonObject jo = new JsonObject();
的應用程序將引發錯誤「不幸的是應用程序的名字HSA停止
與JSONObject的一些問題，我使用的JSONObject那麼它工作正常。
謝謝，
發佈堆棧跟蹤 – Triode
'jsonObject_x'是否已初始化？它在哪裏初始化？ – Raghunandan
在日誌貓我得到類錯誤 無法找到類com.example.accelerometerdemo.MainActivity.getAccelerometer引用的類'com.google.gson.JsonObject' – nirvanastack