Question

问题是写入outputstreamswriter的字符串具有正确的值但是在onclick（）方法中的try / catch块中，对话框输出流写入器的方法不起作用。我的文件名是default.txt我确定文件名与问题无关。 outputstreamwriter不会改变文件的内容，无论我尝试过bufferwriter还是fileoutputstream，但似乎没有任何工作。请帮助我从几天开始失去理智！

这里是代码。

package zafus.personalitymeter;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.List;

import android.R.integer;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.RelativeLayout.LayoutParams;

public class ChoseAnswers extends Activity {
private final String TAG="";
public String vale;

public List<String> obj;
public int numOfAnswers=0;
//public RelativeLayout mylayout =(RelativeLayout)findViewById(R.id.calayout);
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_chose_answers);
    obj=null;
    obj=readFromFile("answer.txt", this);
    numOfAnswers=Integer.valueOf(obj.get(0).toString());
    int i=1;
    LinearLayout mylayout =(LinearLayout)findViewById(R.id.linearLayout1);

    while(i<=numOfAnswers){
        Button tt = new Button(this);
        tt.setText(obj.get(i));
        tt.setId(i+1);
        tt.setPadding(5, 10, 5, 10);

        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);  
        tt.setOnClickListener( new OnClickListener() {

            @Override
            public void onClick(View v) {
                vale=((Button)v).getText().toString();
                AlertDialog.Builder dlgAlert1  = new AlertDialog.Builder(ChoseAnswers.this);
                dlgAlert1.setMessage("Show this answer as a result of next test?");

                dlgAlert1.setPositiveButton("Yes",new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        obj=null;
                        obj=readFromFile("default.txt", ChoseAnswers.this);
                        obj.set(1,vale);
                        String receiveString = "";
                        int num=Integer.valueOf(obj.get(0))+2;
                        StringBuilder ab = new StringBuilder();
                        int i=0;
                        for(;i<num;i++){
                            ab.append(obj.get(i)+"\n");
                        }

                        receiveString=ab.toString();

                        try {
                            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(openFileOutput("default.txt", Context.MODE_PRIVATE));
                             //outputStreamWriter.write("");
                            outputStreamWriter.write(receiveString);  
                            outputStreamWriter.close();
                            }


                        catch (IOException e) {
                            Log.e(TAG, "File write failed: " + e.toString());
                        }

                        ChoseAnswers.this.finish(); 
                    }});  

                dlgAlert1.setNegativeButton("No",new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {

                    }});
            dlgAlert1.show();


            }
        });
        if (i == 1){

            params.setMargins(0, 150, 0, 20);

        }
        else{
            params.setMargins(0, 20, 0, 20);
        }
        tt.setLayoutParams(params);
        tt.setBackgroundResource(R.drawable.bxml);
        tt.setTextColor(Color.parseColor("#330011"));
        mylayout.addView(tt);


       i++;
    }

}


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


public static List<String> readFromFile(String fileName, Context context) {

List<String> words = new ArrayList<String>();

InputStream fIn = null;
InputStreamReader isr = null;
BufferedReader input = null;
try {
    fIn = context.getResources().getAssets().open(fileName, context.MODE_WORLD_READABLE);
    isr = new InputStreamReader(fIn);
    input = new BufferedReader(isr);
    String line = "";
    while ((line = input.readLine()) != null) {
        words.add(line);
    }
} catch (Exception e) {
    e.getMessage();
} finally {
    try {
        if (isr != null)
            isr.close();
        if (fIn != null)
            fIn.close();
        if (input != null)
            input.close();
    } catch (Exception e2) {
        e2.getMessage();
    }
}



return words;

} }

Answer 1

在onClick中，您从资源中读取文件并将其保存到内部存储器中。在下一次单击时，同样的情况发生。如果要检查写入是否成功，也应该从内部存储器中读取文件。

在对话框的onclick（）方法中更改文本文件的内容

1 个答案: