Android Studio create Diconary mit Dateien auf internen Speicher

Question

im Moment arbeitet an einer Notes App für Android. Das Problem: Ich weiß nicht, wie ich den TXT speichern kann. Dateien meiner App auf meinem internen Speicher. Ich habe es bereits mit externem Speicher verschlüsselt. Hier ist mein Code (MainActivity.java)

`package de.tkdevelopment.notizen; 

import android.content.Context; 
import android.content.Intent; 
import android.os.Bundle; 
import android.os.Environment; 
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.view.View; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 

import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.OutputStream; 


public class MainActivity extends AppCompatActivity { 


    Button btn; 
    EditText editText; 
    File ordner; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 




     ordner = new File(Environment.getExternalStorageDirectory(), "NotizenApp"); //Ordnername 
     if(!ordner.exists()){ 
      ordner.mkdirs(); 
     } 

     editText = (EditText) findViewById(R.id.editText); 
     btn = (Button) findViewById(R.id.button); 
     btn.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       if (editText.getText().length() > 0){ //Wenn Text länger als 0 dann Spiechern 

        File notizdatei = new File(ordner, "Notiz_" + System.currentTimeMillis() + ".txt"); 
        try { 
         OutputStream outputStream = new FileOutputStream(notizdatei); 
         outputStream.write(editText.getText().toString().getBytes()); 
         outputStream.close(); 
         editText.setText(null); 
         Toast.makeText(getApplicationContext(), "Notiz gespeichert", Toast.LENGTH_LONG); 
        } catch (FileNotFoundException e) { 
         e.printStackTrace(); 
        } catch (IOException e) { 
         e.printStackTrace(); 
        } 


       }else { //Sonst nicht Speichern 
        Toast.makeText(getApplicationContext(), "Kein Text vorhanden", Toast.LENGTH_SHORT).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.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_view_notes) { 

      if(ordner.listFiles().length > 0){ 

       startActivity(new Intent(MainActivity.this, Notizen_auslesen.class)); 

      } else { 
       Toast.makeText(getApplicationContext(), "Keine Notizen vorhanden", Toast.LENGTH_SHORT).show(); 
      } 



      return true; 
     } 

     return super.onOptionsItemSelected(item); 
    } 
} 
` 

Answer 1

diese Methode, um Ihre Aktivität hinzufügen:

public String storeToInternalStorage(Context context,String data) { 
    ContextWrapper cw = new ContextWrapper(context); 
    // path to /data/data/yourapp/app_data/PrivateFiles 
    File directory = cw.getDir("PrivateFiles", Context.MODE_PRIVATE); 
    File file = new File(directory, "filename.txt"); 
    try { 

     FileOutputStream fileOutputStream = new FileOutputStream(file); 
     fileOutputStream.write(data.getBytes()); 
     fileOutputStream.close(); 

    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    return file.getAbsolutePath(); 
} 

Und dann verwenden Sie es wie folgt aus:

btn.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      if (editText.getText().length() > 0){ 
       String data = editText.getText().toString().trim(); 
       String fileStoredPath = storeToInternalStorage(this, data); 
       Log.d("TAG","File is stored at:" + fileStoredPath); 
      } 
});