添加扩展手动imputted文件名 [英] Add extension to a manually imputted filename

问题描述

这么多的尝试后，我一直没有用户输入的名称设置为一个文件，并自动把扩展名结尾。因此，在我来说，我有一个简单的txt文件，我想用onClickListener保存我的文件。

After so many attempts, I've failed to set a user input name to a file and automatically put an extension at the end. So in my case I have a simple .txt, I'm trying to save my file using onClickListener.

通常情况下它会工作，如：

Normally it would work like:

public void onClick(View view) {                
            try {
                FileOutputStream fout =
                    openFileOutput("filename_here.txt" , MODE_WORLD_READABLE);

但我想，让用户设置个人的标题在这里，所以我这在我的活动：

But I'd like to let the user set a personal title here, so I've this in my Activity:

        save.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Message = maintext.getText().toString();
            try {
                FileOutputStream fout = openFileOutput(title.getText().toString()+".txt" , MODE_WORLD_READABLE); //look at the extension .txt
                OutputStreamWriter outsw = new OutputStreamWriter(fout);
                try {
                    outsw.write(Message);
                    outsw.flush();
                    outsw.close();
                    Toast.makeText(getBaseContext(), "Your file has been saved", Toast.LENGTH_LONG).show();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }
    });

我不知道，如果这种方式来添加一个扩展可能的，但每当我打保存按钮我的应用程序崩溃！

I don't know if this way to add an extension is possible but whenever I hit the save button my app crash!

推荐答案

我不得不手动把我的文件名在OnCreate无效，在其中我将自己的扩展结束：

I had to manually put my FileName in the onCreate void, at the end of which I added my extension:

public class Save extends ActionBarActivity {

String FileName; //specify "FileName" as a string
EditText et;     //and "et" as an EditText

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    this.setContentView(R.layout.activity_save);
    Button save = (Button) findViewById(R.id.SAVE);
    final EditText maintext = (EditText) findViewById(R.id.test); //my main text where i put personal things.        
    et = (EditText) findViewById(R.id.save_filename); //assign et (EditText) to an object (or vice-versa). In this case, EditText is found in my XML with id save_filename        


//Now setting onClickListener
save.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            try {
                //This line below make the trick
                //We set a string, FileName, to contain a name we input in our "et" EditText and an extension added with the + ".txt" (note that there are no space before and after the .txt)
                FileName = et.getText().toString() + ".txt"; 
                FileOutputStream fout = openFileOutput(FileName, Context.MODE_PRIVATE);
                OutputStreamWriter outsw = new OutputStreamWriter(fout);
                try {
                    outsw.write(String.valueOf(maintext));
                    outsw.flush();
                    outsw.close();
                    Toast.makeText(getBaseContext(), "File Saved Successfully", Toast.LENGTH_SHORT).show();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }

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