Android 在 Intent.ACTION_GET_CONTENT 之后打开要阅读的文本文件
Android open text file to read after Intent.ACTION_GET_CONTENT
流程是:
- 用户需要 select 文本文件和默认 Android 浏览器弹出。
- 然后我想存储包含文件名的字符串,以实际打开文件进行读取。
- 我想打开该文件并将其重写为应用程序内部存储上的新文件。
- 我想从应用内部存储打开新创建的文件。
- 奖励 1 - 如果它现在是
.txt
文件但 .doc
,我想在上面的重写步骤 3 中将他转换为常规 .txt
文件。
奖励 2 - 如何处理大文本文件?
代码如下:
// 1. Start with user action pressing on button to select file
addButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");
startActivityForResult(intent, PICKFILE_RESULT_CODE);
}
});
// 2. Come back here
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == PICKFILE_RESULT_CODE) {
// Get the Uri of the selected file
Uri uri = data.getData();
String filePathName = "WHAT TODO ?";
LaterFunction(filePathName);
}
}
// 3. Later here
public void LaterFunction(String filePathName) {
BufferedReader br;
FileOutputStream os;
try {
br = new BufferedReader(new FileReader("WHAT TODO ?"));
//WHAT TODO ? Is this creates new file with
//the name NewFileName on internal app storage?
os = openFileOutput("newFileName", Context.MODE_PRIVATE);
String line = null;
while ((line = br.readLine()) != null) {
os.write(line.getBytes());
}
br.close();
os.close();
lastFunction("newFileName");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
// 4. And in the end here
public void lastFunction(String newFileName) {
//WHAT TODO? How to read line line the file
//now from internal app storage?
}
第 1 步:删除 String filePathName = "WHAT TODO ?";
第 2 步:将 LaterFunction(filePathName);
更改为 LaterFunction(uri);
第 3 步:将 br = new BufferedReader(new FileReader("WHAT TODO ?"));
更改为 br = new BufferedReader(new InputStreamReader(getContentResolver().openInputStream(uri));
这是解决您的问题所需的最低限度。
但是,*/*
的 MIME 类型将匹配任何类型的文件,而不仅仅是文本文件。不应使用 readLine()
复制二进制文件。如果您只想要纯文本文件,请使用 text/plain
而不是 */*
。
对于那些努力修复该代码的人来说,这里是固定的代码
ab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");
startActivityForResult(intent, PICKFILE_RESULT_CODE);
}
});
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICKFILE_RESULT_CODE) {
Uri uri = data.getData();
LaterFunction(uri);
}
}
public void LaterFunction(Uri uri) {
BufferedReader br;
FileOutputStream os;
try {
br = new BufferedReader(new InputStreamReader(getContentResolver().openInputStream(uri)));
//WHAT TODO ? Is this creates new file with
//the name NewFileName on internal app storage?
os = openFileOutput("newFileName", Context.MODE_PRIVATE);
String line = null;
while ((line = br.readLine()) != null) {
os.write(line.getBytes());
Log.w("nlllllllllllll",line);
}
br.close();
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
流程是:
- 用户需要 select 文本文件和默认 Android 浏览器弹出。
- 然后我想存储包含文件名的字符串,以实际打开文件进行读取。
- 我想打开该文件并将其重写为应用程序内部存储上的新文件。
- 我想从应用内部存储打开新创建的文件。
- 奖励 1 - 如果它现在是
.txt
文件但.doc
,我想在上面的重写步骤 3 中将他转换为常规.txt
文件。
奖励 2 - 如何处理大文本文件?
代码如下:
// 1. Start with user action pressing on button to select file
addButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");
startActivityForResult(intent, PICKFILE_RESULT_CODE);
}
});
// 2. Come back here
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == PICKFILE_RESULT_CODE) {
// Get the Uri of the selected file
Uri uri = data.getData();
String filePathName = "WHAT TODO ?";
LaterFunction(filePathName);
}
}
// 3. Later here
public void LaterFunction(String filePathName) {
BufferedReader br;
FileOutputStream os;
try {
br = new BufferedReader(new FileReader("WHAT TODO ?"));
//WHAT TODO ? Is this creates new file with
//the name NewFileName on internal app storage?
os = openFileOutput("newFileName", Context.MODE_PRIVATE);
String line = null;
while ((line = br.readLine()) != null) {
os.write(line.getBytes());
}
br.close();
os.close();
lastFunction("newFileName");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
// 4. And in the end here
public void lastFunction(String newFileName) {
//WHAT TODO? How to read line line the file
//now from internal app storage?
}
第 1 步:删除 String filePathName = "WHAT TODO ?";
第 2 步:将 LaterFunction(filePathName);
更改为 LaterFunction(uri);
第 3 步:将 br = new BufferedReader(new FileReader("WHAT TODO ?"));
更改为 br = new BufferedReader(new InputStreamReader(getContentResolver().openInputStream(uri));
这是解决您的问题所需的最低限度。
但是,*/*
的 MIME 类型将匹配任何类型的文件,而不仅仅是文本文件。不应使用 readLine()
复制二进制文件。如果您只想要纯文本文件,请使用 text/plain
而不是 */*
。
对于那些努力修复该代码的人来说,这里是固定的代码
ab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");
startActivityForResult(intent, PICKFILE_RESULT_CODE);
}
});
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICKFILE_RESULT_CODE) {
Uri uri = data.getData();
LaterFunction(uri);
}
}
public void LaterFunction(Uri uri) {
BufferedReader br;
FileOutputStream os;
try {
br = new BufferedReader(new InputStreamReader(getContentResolver().openInputStream(uri)));
//WHAT TODO ? Is this creates new file with
//the name NewFileName on internal app storage?
os = openFileOutput("newFileName", Context.MODE_PRIVATE);
String line = null;
while ((line = br.readLine()) != null) {
os.write(line.getBytes());
Log.w("nlllllllllllll",line);
}
br.close();
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}