我检查了它，每次我试图运行该项目 这使我的应用程序崩溃... 在while循环上堆栈.. 并且不要退出循环
主要代码：
package com.example.omermalka.jasonparsingdemo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "com.example.omermalka.jasonparsingdemo";
private TextView tvData;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
Log.i(TAG, "1");
Button btnHit = (Button)findViewById(R.id.btnHit);
tvData = (TextView)findViewById(R.id.tvJsonItem);
Log.i(TAG,"2");
btnHit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new JsonTask().execute("http://jsonparsing.parseapp.com/jsonData/moviesDemoItem.txt");
Log.i(TAG,"2");
}
});
}
public class JsonTask extends AsyncTask<String,String,String>
{
@Override
protected String doInBackground(String... params) {
Log.i(TAG,"3");
//connecting to the Server
HttpsURLConnection connection = null;
BufferedReader reader = null;
Log.i(TAG,"3.1");
try {
URL url = new URL(params[0]);
Log.i(TAG, params[0]+"");
connection = (HttpsURLConnection) url.openConnection();
Log.i(TAG, "3.15");
connection.connect();
Log.i(TAG, "3.2");
InputStream stream = connection.getInputStream();
//that will take the strem from the connection and
//stoage that on the stream object
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer();
String line = reader.readLine();
Log.i(TAG,"4");
//the line is read the line from the Buffer Reader
//and add it to the StringBuffer
while ((line != null)) {
Log.i(TAG,"5");
buffer.append(line);
}
return buffer.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
tvData.setText(result);
}
}
/*
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}*/
}
错误日志 ：
12-08 05:06:05.854 16934-16990/com.example.omermalka.jasonparsingdemo E/dalvikvm-heap: Out of memory on a 57283554-byte allocation.
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: Process: com.example.omermalka.jasonparsingdemo, PID: 16934
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: java.lang.RuntimeException: An error occured while executing doInBackground()
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at android.os.AsyncTask$3.done(AsyncTask.java:300)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at java.util.concurrent.FutureTask.run(FutureTask.java:242)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at java.lang.Thread.run(Thread.java:841)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: Caused by: java.lang.OutOfMemoryError
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at java.lang.AbstractStringBuilder.enlargeBuffer(AbstractStringBuilder.java:94)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at java.lang.AbstractStringBuilder.append0(AbstractStringBuilder.java:145)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at java.lang.StringBuffer.append(StringBuffer.java:219)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at com.example.omermalka.jasonparsingdemo.MainActivity$JsonTask.doInBackground(MainActivity.java:95)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at com.example.omermalka.jasonparsingdemo.MainActivity$JsonTask.doInBackground(MainActivity.java:61)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at android.os.AsyncTask$2.call(AsyncTask.java:288)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
12-08 05:06:05.858 16934-16990/com.example.omermalka.jasonparsingdemo E/AndroidRuntime: at java.lang.Thread.run(Thread.java:841)
感谢所有帮助者!!
答案 0 :(得分：1)
将HttpsURLConnection更改为HttpURLConnection
，因为您的链接是http://jsonparsing.parseapp.com/jsonData/moviesDemoItem.txt
并将readLine（）置于while条件下。
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