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我在我的SD卡文件夾中有多個文本文件,並且我構建了一個允許用戶選擇所需文件的活動。如何從android應用程序獲取文件的完整路徑
但stil,我必須使用傳遞文件路徑到文件構造函數(請參見line2)。 textfile.java:
File sdcard = Environment.getExternalStorageDirectory();
//Get the text file
File file = new File(sdcard,"my/ans.txt");//line2
//ob.pathh
//Read text from file
StringBuilder text = new StringBuilder();
try {
BufferedReader br = new BufferedReader(new FileReader(file));
}
我想的第二個參數即文件路徑將被存儲爲字符串。
有沒有什麼辦法可以得到所選文件的完整路徑。
我已經使用的代碼如下:
AndroindApplication的.java:
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class AndroindApplication extends ListActivity {
private List<String> item = null;
public List<String> path = null;
private String root="/";
private TextView myPath;
public String pathh;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sdcard);
myPath = (TextView)findViewById(R.id.path);
getDir("/sdcard/");
}
private void getDir(String dirPath)
{
myPath.setText("Location: " + dirPath);
item = new ArrayList<String>();
path = new ArrayList<String>();
File f = new File(dirPath);
File[] files = f.listFiles();
if(!dirPath.equals(root))
{
item.add(root);
path.add(root);
item.add("../");
path.add(f.getParent());
}
for(int i=0; i < files.length; i++)
{
File file = files[i];
path.add(file.getPath());
if(file.isDirectory())
item.add(file.getName() + "/");
else
item.add(file.getName());
}
ArrayAdapter<String> fileList =
new ArrayAdapter<String>(this, R.layout.row, item);
setListAdapter(fileList);
}
@Override
protected void onListItemClick(ListView l, View view, int position, long id) {
File file = new File(path.get(position));
pathh=path.get(position);
Log.e("path="+path,"dxgx");
if (file.isDirectory())
{
if(file.canRead())
getDir(path.get(position));
else
{
new AlertDialog.Builder(this)
.setIcon(R.drawable.icon)
.setTitle("[" + file.getName() + "] folder can't be read!")
.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).show();
}
}
else
{
Intent myIntent = new Intent(view.getContext(), textfile.class);//goes to textfile.java
startActivityForResult(myIntent, 0);
}
}
}
我需要的絕對路徑,這樣我可以把它傳遞給
File file = new File(sdcard,"my/ans.txt");//line2
和Don」當必須打開一個新文件時,不得不在代碼中指定文件路徑
是否有我可以從AndroidApplication.java獲取它?
我file.getAbsolutePath(試過),並把它裏面Log.d(「MyApp」,file.getAbsolutePath());在輸出中,它給了sd [/ – ProgramME 2011-04-09 16:53:36
它沒有給出完整路徑.i在文件file = new File(path.get (位置)); – ProgramME 2011-04-09 16:54:26
是'my/ans.txt'資源文件還是文件,它的完整路徑是'/ mnt/sdcard/my/ans.txt'或類似的東西? – MByD 2011-04-09 17:03:57