[英]Android java :Passing with the path between two activity
我是android开发的新手,目前正在开发CalendarNote应用。
我做了很多研究,并尝试了很多相关代码,但仍然没有成功。 任何人都可以帮助我或给我一些指导,以便我不会迷路。 谢谢。
以下是创建文件夹的代码:
btn_cFolder.setOnClickListener(new OnClickListener() {
public void onClick(View v)
{
String dateN = edit_date.getText().toString();
new AlertDialog.Builder(DatePickerActivity.this, AlertDialog.THEME_HOLO_DARK)
.setTitle("Create Folder")
.setMessage("Confirm to create " + dateN +" folder ?")
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Environment.getExternalStorageDirectory();
String dateN = edit_date.getText().toString();
edit_date.setTypeface(edit_date.getTypeface(), Typeface.BOLD_ITALIC);
File folder = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/CalendarNote/" + dateN);
boolean success = true;
if (!folder.exists()) {
success = folder.mkdirs();
}
if (success) {
Toast.makeText(getBaseContext(), "You have successfully created." , Toast.LENGTH_LONG ).show();
Intent w = new Intent(DatePickerActivity.this, SelectTypeActivity.class);
startActivity(w);
} else {
Toast.makeText(getBaseContext(), "You have Failed to create." , Toast.LENGTH_LONG ).show();
}
}
})
.setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// do nothing
}
})
.setIcon(R.drawable.ic_launcher)
.show();
}
});
这是创建txt文件的代码:
public void SaveListener() {
imb_savefile = (ImageButton) findViewById(R.id.imb_savefile);
imb_savefile.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
edit_date = (EditText) findViewById(R.id.edit_date);
String t = edit_title.getText().toString();
new AlertDialog.Builder(WriteNoteActivity.this, AlertDialog.THEME_HOLO_DARK)
.setTitle("Save Note")
.setMessage("Confirm to save " + t +"?")
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
String content = edit_content.getText().toString();
String title = edit_title.getText().toString();
String dateN = edit_date.getText().toString();
boolean success = true;
try {
File sdCardDir = Environment.getExternalStorageDirectory();
File targetFile;
targetFile = new File(sdCardDir.getCanonicalPath()
+ "/CalendarNote/"+ dateN);
File file=new File(targetFile + "/"+title+".txt");
if(!targetFile.exists()){
success = targetFile.mkdir();
}
RandomAccessFile raf = new RandomAccessFile(file, "rw");
raf.seek(file.length());
raf.write(content.getBytes());
raf.close();
} catch (IOException e) {
e.printStackTrace();
}
if (success) {
Toast.makeText(getBaseContext(), "You have successfully created." , Toast.LENGTH_LONG ).show();
} else {
Toast.makeText(getBaseContext(), "You have Failed to create." , Toast.LENGTH_LONG ).show();
}
//Toast.makeText(getBaseContext(), "Note have successfully saved." , Toast.LENGTH_LONG ).show();
}
})
.setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(getBaseContext(), "Note Cancelled." , Toast.LENGTH_LONG ).show();
}
})
.setIcon(R.drawable.ic_launcher)
.show();
}
});
}
dateN是创建文件夹的关键。
[2014年3月15日更新]实际上,在选择日期(DatePickerActivity)>>选择注释类型(SelectTypeActivity)>>写txt文件(WriteNoteActivity)之后,您好。 这是过程。 到目前为止,我使用@Hamid Shatu建议这确实很有帮助! 但是我必须将意图SelectTypeActivity.class更改为WriteNoteActivity.class,这样才能成功,如何无需跳过SelectTypeActivity也能够做到的呢? =)对不起,我的英语不好。
通过Intent
putExtra()
方法将文件夹路径传递给SelectTypeActivity
,如下所示...
String folderPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/CalendarNote/" + dateN;
File folder = new File(folderPath);
boolean success = true;
if (!folder.exists()) {
success = folder.mkdirs();
}
if (success) {
Toast.makeText(getBaseContext(), "You have successfully created." , Toast.LENGTH_LONG ).show();
Intent w = new Intent(DatePickerActivity.this, SelectTypeActivity.class);
w..putExtra("folderpath", folderPath);
startActivity(w);
} else {
Toast.makeText(getBaseContext(), "You have Failed to create." , Toast.LENGTH_LONG ).show();
}
使用SelectTypeActivity
类中的getStringExtra()
方法从Extra
检索该文件夹路径,如下所示...
//File sdCardDir = Environment.getExternalStorageDirectory();
//File targetFile;
//targetFile = new File(sdCardDir.getCanonicalPath()
+ "/CalendarNote/"+ dateN);
String folderPath = getIntent().getStringExtra("folderpath");
File file=new File(folderPath + "/"+title+".txt");
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