android studio文件内部存储,Android Studio使用内部存储上的文件创建diconary-优快云博客

该博客介绍了如何在Android应用中利用内部存储保存TXT文件。通过创建一个名为NotizenApp的文件夹，并在用户输入文本后，将文本内容写入到以当前时间戳命名的TXT文件中。如果文本为空，则不进行保存操作。代码示例展示了如何使用FileOutputStream来实现这一功能。

即时通讯工具正在Android的Notes应用程序中使用。问题：我不知道如何保存txt。我的内部存储上的应用程序文件。我已经用外部存储编码了它。这里是我的代码(MainActivity.java)Android Studio使用内部存储上的文件创建diconary

`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);

}

2016-07-06

Tom