我只是想在模拟器上显示sdcard中的文件内容（如图像文件/视频文件/音乐文件那样）。
以下是我的代码。
public class listfiles extends ListActivity {
private ArrayList<String> item = null;
private ArrayList<String> path = null;
private String root="/";
private TextView myPath;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sub);
myPath = (TextView)findViewById(R.id.path);
getDir(root);
}
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 v, int position, long id) {
File file = new File(path.get(position));
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() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).show();
}
}
else
{
new AlertDialog.Builder(this)
.setIcon(R.drawable.icon)
.setTitle("[" + file.getName() + "]")
.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}).show();
}
}
}
在我的输出中，我得到了文件路径＆amp;文件名。但是当我点击文件时，它不会显示内容。我该怎么办？感谢
最后我明白了。我修改过的代码如下所示..
public class SDCardActivity extends ListActivity {
private List<String> item = null;
private List<String> path = null;
private String root="/sdcard";
private TextView myPath;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Intent intent=getIntent();
setContentView(R.layout.sub);
myPath = (TextView)findViewById(R.id.path);
getDir(root);
}
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 v, int position, long id) {
File file = new File(path.get(position));
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
dialog.dismiss();
}
}).show();
}
}
else
{
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
Uri uri = Uri.parse("file://" + file.getPath());
String fname=file.getName();
if(fname.endsWith(".jpeg")||fname.endsWith("png")||fname.endsWith(".gif"))
{
intent.setDataAndType(uri, "image/*");
startActivity(intent);
}
else if(fname.endsWith(".mp4")||fname.endsWith(".3gp"))
{
intent.setDataAndType(uri, "video/*");
startActivity(intent);
}
else if(fname.endsWith(".mp3"))
{
intent.setDataAndType(uri, "audio/*");
startActivity(intent);
}
else
try {
EditText tv = (EditText)findViewById(R.id.tn);
StringBuilder text = new StringBuilder();
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
text.append(line);
text.append('\n');
//Set the text
tv.setText(text);
}
}//try
catch (IOException e) {
//You'll need to add proper error handling here
}//catch
}
}
}
答案 0 :(得分：8)
下面的代码展示了如何从SDcard.simple中读取文件内容，在Sdcard中插入一个文本文件，并在程序中的代码下面实现。
try{
File f = new File(Environment.getExternalStorageDirectory()+"/f1.txt");
fileIS = new FileInputStream(f);
BufferedReader buf = new BufferedReader(new InputStreamReader(fileIS));
String readString = new String();
//just reading each line and pass it on the debugger
while((readString = buf.readLine())!= null){
textdata.setText(readString);
Log.d("line: ", readString);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e){
e.printStackTrace();
}
答案 1 :(得分：4)
也许我在您的代码中错过了它，但我无法在其中发现任何Intent。对于要显示的文件，您必须使用Intent标记调用ACTION_VIEW。
例如。
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
Uri imgUri = Uri.parse("file://" + file.getPath());
intent.setDataAndType(imgUri, "image/*");
startActivity(intent);
您可以简单地创建Intent的实例，在我们的案例中设置ACTION_VIEW的操作。然后通过将文件对象的路径连接到Uri来创建file://对象。您现在要做的就是通过指定uri和类型字符串来设置数据并输入意图。在我的例子中每个图像类型。但是，您可以只指定某种图像类型。一旦你的意图被设置并准备就绪，你可以通过以意图作为参数启动一个活动来启动它。
Android将负责寻找合适的应用程序来显示意图中的数据。