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POApplication says: Unfortunately stopped. (on adding JsonObject from google)
 

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  1. POApplication says: Unfortunately stopped. (on adding JsonObject from google)
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    <p>I am trying to push data to a server after taking values from the accelerometer.</p> <p>In that I am using JsonObject from google.</p> <p>There seems to be some problem with this object. As soon as I put instantiate one object from this my application throws an error: Unfortunately appname has stopped.</p> <p>My MainActivity code:</p> <pre><code>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 &lt; 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); } } </code></pre> <p>The moment I add this</p> <pre><code> JsonObject jo = new JsonObject(); </code></pre> <p>The application throws an error "Unfortunately appname hsa stopped.</p> <p>SOme issue with JsonObject. I used JSONObject then it was working fine.</p> <p>Thanks,</p>
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    1. USRaghunandan
    1. USnirvanastack
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      1. POApplication says: Unfortunately stopped. (on adding JsonObject from google)
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    2. CO`jsonObject_x` is initialized?. where is it initialized?
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      1. POApplication says: Unfortunately stopped. (on adding JsonObject from google)
      1. USRaghunandan
    3. COIn Log Cat I get class error Could not find class 'com.google.gson.JsonObject', referenced from method com.example.accelerometerdemo.MainActivity.getAccelerometer
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      1. POApplication says: Unfortunately stopped. (on adding JsonObject from google)
      1. USnirvanastack
 

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