安卓 ZygoteInit$MethodAndArgsCaller.run() "source not found"

Question

我构建了一个示例应用程序，它从用户那里获取输入并保存在我的应用程序 Assets 文件夹中的文本文件“sample”中。

这是我的 MainActivity.java，

 package com.example.sampledatabaseapp;

 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStreamWriter;
 import android.os.Bundle;
 import android.app.Activity;
 import android.content.Context;
 import android.content.res.AssetManager;
 import android.text.Editable;
 import android.view.Menu;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.Toast;

  public class MainActivity extends Activity {

protected static final android.content.Context Context = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button btn=(Button)findViewById(R.id.button1);
    btn.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            EditText txtname=(EditText)findViewById(R.id.editText1);    
            String name=txtname.getText().toString();

             AssetManager am=Context.getAssets();
            try {

                InputStream is=am.open("sample");
                OutputStreamWriter out=new OutputStreamWriter(openFileOutput("sample",MODE_APPEND));
                out.write(name);

                out.close();
                Toast.makeText(Context,"Text Saved !",Toast.LENGTH_LONG).show();

            } catch (IOException e) {

                e.printStackTrace();
                Toast.makeText(Context,"Sorry Text could't be added",Toast.LENGTH_LONG).show();
            }


        }
    });
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

 }

我的 activity_main.xml，

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >

<EditText
    android:id="@+id/editText1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="46dp"
    android:ems="10" 
    android:hint="@string/Enter_Name">

    <requestFocus />
</EditText>

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/editText1"
    android:layout_alignRight="@+id/editText1"
    android:layout_below="@+id/editText1"
    android:layout_marginTop="82dp"
    android:text="@string/Save" />

</RelativeLayout>

我开始逐行调试，当调试器调试“AssetManager am=Context.getAssets();”行时在我的 MainActivity.java 文件中，它显示“未找到 ZygoteInit$MethodAndArgsCaller.run() 的源”。我下载了源代码并附上。

可是，我还是不知道哪里做错了。 这是我的堆栈跟踪，

  12-27 13:32:16.467: D/InputEventConsistencyVerifier(1803): KeyEvent: ACTION_UP but key was not down.
  12-27 13:32:16.467: D/InputEventConsistencyVerifier(1803):   in  android.widget.Button{40d02568 VFED..C. .F....I. 135,168-345,216 #7f070001 app:id/button1}
  12-27 13:32:16.467: D/InputEventConsistencyVerifier(1803):   0: sent at  5236119000000, KeyEvent { action=ACTION_UP, keyCode=KEYCODE_TAB, scanCode=15, metaState=0, flags=0x8, repeatCount=0, eventTime=5236119, downTime=5235983, deviceId=0, source=0x101 }

  12-27 13:32:16.908: W/Trace(1803): Unexpected value from nativeGetEnabledTags: 0
  12-27 13:32:16.938: W/Trace(1803): Unexpected value from nativeGetEnabledTags: 0
  12-27 13:32:16.969: W/Trace(1803): Unexpected value from nativeGetEnabledTags: 0
  12-27 13:32:16.969: W/Trace(1803): Unexpected value from nativeGetEnabledTags: 0
  12-27 13:32:17.008: W/Trace(1803): Unexpected value from nativeGetEnabledTags: 0
  12-27 13:32:17.038: W/Trace(1803): Unexpected value from nativeGetEnabledTags: 0
  12-27 13:32:17.118: W/Trace(1803): Unexpected value from nativeGetEnabledTags: 0
  12-27 13:32:17.148: W/Trace(1803): Unexpected value from nativeGetEnabledTags: 0

我不知道我是否使用了正确的方法在 android 中将文本写入文本文件。如有不妥请指教。

请任何人帮助!!

谢谢。

Answer 1

MODE_APPEND当然是将数据追加到一个已经存在的文件中。如果你想创建一个新的，你应该使用 MODE_PRIVATE

OutputStreamWriter out=new OutputStreamWriter(openFileOutput("sample",MODE_PRIVATE));

当你阅读文件时，

        try {
            FileInputStream fileInputStream;
            fileInputStream = openFileInput("sample");
            byte[] readBytes = new byte[fileInputStream.available()];
            fileInputStream.read(readBytes);
            String readString = new String(readBytes);
            Log.v("readString", readString);
            fileInputStream.close();
        } catch (FileNotFoundException e) {
        } catch (IOException e) {
        }

好的，删除这一行怎么样？

AssetManager am=Context.getAssets();

您不必使用 AssetManager。

然后你使用写这个。

try {
            FileOutputStream fileOutputStream = openFileOutput("myfile.txt", MODE_PRIVATE);
            String writeString = "test";
            fileOutputStream.write(writeString.getBytes());
        } catch (FileNotFoundException e) {
        } catch (IOException e) {
        }