外部および内部ストレージ内の特定のパスにデータを挿入および取得しようとしています。ネットで例を見つけました。成功しました。
これは保存して取得する私のコードです
public class MainActivity extends Activity implements OnClickListener{
private String filename = "MySampleFile.txt";
private String filepath = "MyFileStorage";
File myInternalFile;
File myExternalFile;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ContextWrapper contextWrapper = new ContextWrapper(getApplicationContext());
File directory = contextWrapper.getDir(filepath, Context.MODE_PRIVATE);
myInternalFile = new File(directory , filename);
Button saveToInternalStorage =
(Button) findViewById(R.id.saveInternalStorage);
saveToInternalStorage.setOnClickListener(this);
Button readFromInternalStorage =
(Button) findViewById(R.id.getInternalStorage);
readFromInternalStorage.setOnClickListener(this);
Button saveToExternalStorage =
(Button) findViewById(R.id.saveExternalStorage);
saveToExternalStorage.setOnClickListener(this);
-
Button readFromExternalStorage =
(Button) findViewById(R.id.getExternalStorage);
readFromExternalStorage.setOnClickListener(this);
//check if external storage is available and not read only
if (!isExternalStorageAvailable() || isExternalStorageReadOnly()) {
saveToExternalStorage.setEnabled(false);
}
else {
myExternalFile = new File(getExternalFilesDir(filepath), filename);
}
}
public void onClick(View v) {
EditText myInputText = (EditText) findViewById(R.id.myInputText);
TextView responseText = (TextView) findViewById(R.id.responseText);
String myData = "";
switch (v.getId()) {
case R.id.saveInternalStorage:
try {
FileOutputStream fos = new FileOutputStream(myInternalFile);
fos.write(myInputText.getText().toString().getBytes());
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
myInputText.setText("");
responseText
.setText("MySampleFile.txt saved to Internal Storage...");
break;
case R.id.getInternalStorage:
try {
FileInputStream fis = new FileInputStream(myInternalFile);
// DataInputStream in = new DataInputStream(fis);
BufferedReader br =
new BufferedReader(new InputStreamReader(fis));
String strLine;
while ((strLine = br.readLine()) != null) {
myData = myData + strLine;
}
br.close();
} catch (IOException e) {
e.printStackTrace();
}
myInputText.setText(myData);
responseText
.setText("MySampleFile.txt data retrieved from Internal Storage...");
break;
case R.id.saveExternalStorage:
try {
FileOutputStream fos = new FileOutputStream(myExternalFile);
fos.write(myInputText.getText().toString().getBytes());
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
myInputText.setText("");
responseText
.setText("MySampleFile.txt saved to External Storage...");
break;
case R.id.getExternalStorage:
try {
FileInputStream fis = new FileInputStream(myExternalFile);
DataInputStream in = new DataInputStream(fis);
BufferedReader br =
new BufferedReader(new InputStreamReader(in));
String strLine;
while ((strLine = br.readLine()) != null) {
myData = myData + strLine;
}
in.close();
} catch (IOException e) {
e.printStackTrace();
}
myInputText.setText(myData);
responseText
.setText("MySampleFile.txt data retrieved from Internal Storage...");
break;
}
}
次に、パスが作成されたかどうかを理解するために、すべてのSDカードパスを取得したかった..
storage/sdcard/MyFileStorage ..このコードを使用しています
public class MainActivity extends ListActivity {
List<String>fileList=new ArrayList<String>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
File root=
new File(Environment.getExternalStorageDirectory().getAbsolutePath());
listDir(root);
ArrayAdapter<String>adapter=
new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,fileList);
this.setListAdapter(adapter);
}
private void listDir(File f) {
File[]files=f.listFiles();
for (File file : files) {
fileList.add(file.getPath());
}
}
}
しかし、私はこのパスを以下に表示することを除いて.しかし、それは存在しません.何が間違っていますか
storage/sdcard/MyFileStorage