当我启动我的应用程序时，它工作正常，但一旦我点击按钮将我带到MakeRap.activity，它就会崩溃。我检查了 MakeRap 的 Activity ，似乎没有错误。
这是日志猫所说的:
06-07 11:57:09.173: I/Adreno200-EGLSUB(14785): <ConfigWindowMatch:2087>: Format RGBA_8888.
06-07 11:57:09.203: D/memalloc(14785): ion: Mapped buffer base:0x52531000 size:2088960 offset:0 fd:60
06-07 11:57:09.203: D/OpenGLRenderer(14785): Enabling debug mode 0
06-07 11:57:09.503: D/memalloc(14785): ion: Mapped buffer base:0x52ea4000 size:2088960 offset:0 fd:64
06-07 11:57:10.955: D/AndroidRuntime(14785): Shutting down VM
06-07 11:57:10.955: W/dalvikvm(14785): threadid=1: thread exiting with uncaught exception (group=0x40aaea08)
06-07 11:57:10.975: E/AndroidRuntime(14785): FATAL EXCEPTION: main
06-07 11:57:10.975: E/AndroidRuntime(14785): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.soloinc.meip/com.soloinc.meip.MakeRapActivity}: java.lang.ArrayIndexOutOfBoundsException: length=1; index=1
06-07 11:57:10.975: E/AndroidRuntime(14785): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2225)
06-07 11:57:10.975: E/AndroidRuntime(14785): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2260)
06-07 11:57:10.975: E/AndroidRuntime(14785): at android.app.ActivityThread.access$600(ActivityThread.java:139)
06-07 11:57:10.975: E/AndroidRuntime(14785): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1277)
06-07 11:57:10.975: E/AndroidRuntime(14785): at android.os.Handler.dispatchMessage(Handler.java:99)
06-07 11:57:10.975: E/AndroidRuntime(14785): at android.os.Looper.loop(Looper.java:156)
06-07 11:57:10.975: E/AndroidRuntime(14785): at android.app.ActivityThread.main(ActivityThread.java:5045)
06-07 11:57:10.975: E/AndroidRuntime(14785): at java.lang.reflect.Method.invokeNative(Native Method)
06-07 11:57:10.975: E/AndroidRuntime(14785): at java.lang.reflect.Method.invoke(Method.java:511)
06-07 11:57:10.975: E/AndroidRuntime(14785): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-07 11:57:10.975: E/AndroidRuntime(14785): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-07 11:57:10.975: E/AndroidRuntime(14785): at dalvik.system.NativeStart.main(Native Method)
06-07 11:57:10.975: E/AndroidRuntime(14785): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=1; index=1
06-07 11:57:10.975: E/AndroidRuntime(14785): at com.soloinc.meip.MakeRapActivity.onCreate(MakeRapActivity.java:59)
06-07 11:57:10.975: E/AndroidRuntime(14785): at android.app.Activity.performCreate(Activity.java:4543)
06-07 11:57:10.975: E/AndroidRuntime(14785): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071)
06-07 11:57:10.975: E/AndroidRuntime(14785): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2181)
06-07 11:57:10.975: E/AndroidRuntime(14785): ... 11 more
这里MakeRapActivity:
import java.io.BufferedReader;
import java.io.Console;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class MakeRapActivity extends Activity
{
ListView instruments_list;
protected List<String> instrument_title_list;
protected List<String> instrument_audio_file_list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_make_rap);
// Get ListView object from xml
instruments_list = (ListView) findViewById(R.id.instruments_list);
//Getting list of all files From name_mapping.txt
instrument_title_list = new ArrayList<String>();
instrument_audio_file_list = new ArrayList<String>();
InputStream inputStream = getResources().openRawResource(R.raw.name_mapping);
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line = null;
try
{
line = reader.readLine();
}
catch (IOException e)
{
e.printStackTrace();
}
while (line != null)
{
String[] temp = line.split(",");
instrument_audio_file_list.add(temp[0]);
instrument_title_list.add(temp[1]);
try
{
line = reader.readLine();
}
catch (IOException e)
{
e.printStackTrace();
}
}
try {
reader.close();
inputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Define a new Adapter
// First parameter - Context
// Second parameter - Layout for the row
// Third parameter - ID of the TextView to which the data is written
// Forth - the Array of data
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, android.R.id.text1, instrument_title_list);
// Assign adapter to ListView
instruments_list.setAdapter(adapter);
// ListView Item Click Listener
instruments_list.setOnItemClickListener(new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,long id)
{
// ListView Clicked item value
String instrument_title_clicked = (String) instruments_list.getItemAtPosition(position);
Intent intent = new Intent(MakeRapActivity.this,RecordRap.class);
intent.putExtra("instrument_title",instrument_title_clicked);
intent.putExtra("instrument_file_name", get_Instrument_file_name(instrument_title_clicked));
startActivity(intent);
}
});
}
@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;
}
public String get_Instrument_file_name(String instrument_title)
{
int position = 0;
for(int i = 0; i < instrument_title_list.size(); i++)
{
if(instrument_title_list.get(i).equals(instrument_title))
{
position = i;
}
}
return instrument_audio_file_list.get(position);
}
}
这是按钮的 Activity :
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
public class MainActivity extends Activity implements OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@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 void onClick(View view)
{
switch(view.getId())
{
case R.id.button1:
//creating an intent to goto activity to add a new record
Intent it=new Intent(MainActivity.this,MakeRapActivity.class);
//starting new activity
startActivity(it);
break;
}
}
}
最佳答案
您的问题出在以下几行
String[] temp = line.split(",");
instrument_audio_file_list.add(temp[0]);
instrument_title_list.add(temp[1]);
发生的崩溃是索引越界异常，表明数组的大小为 1，并且您正在尝试访问数组中只有 1 个元素的第二个元素。当您使用 split 命令时，它将始终有第一个条目，但不保证有更多条目。问题是在某些时候您遇到一个不包含“,”的行变量，并且您会收到越界错误。
改成这样
String[] temp = line.split(",");
instrument_audio_file_list.add(temp[0]);
if (temp.length > 1) {
instrument_title_list.add(temp[1]);
} else {
instrument_title_list.add("");
}
这将确保您不会发生崩溃，并且如果没有逗号，则会插入一个空字符串。
这也可以通过修复输入文件以确保每一行至少有一个逗号来解决。取决于您想要的结果。
关于java - 我的应用程序总是崩溃，并且似乎找不到任何错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24099695/