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Android 文件浏览器总结
文件浏览器用来读取android系统中的所有文件和文件夹。具体说明如下：
最上面显示当前的文件路径。如果是根目录，则显示“根目录”；
第二行是返回上一级按钮。如果当前处于根目录下，则该行不显示；
文件显示使用listView控件，所有文件一次性加载完毕；若当前是文件夹，则可点击，进入下一级目录，若是文件，则点击，默认为选中该文件。返回文件名，并关闭文件浏览器。
例：
文件浏览器Activity
public class FileManagerActivity extends Activity {
private TextView mCurrentPath;
private TextView mReturn;
private ListView mList;
private View mPathLine;
private String mReturnPath = null;
private FileManagerAdapter adapter;
private ArrayList<Map<String, Object>> infos = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.file_list);
initView();
}
private void initView() {
mCurrentPath = (TextView) findViewById(R.id.file_path);
mPathLine = findViewById(R.id.file_path_line);
mReturn = (TextView) findViewById(R.id.file_return);
mList = (ListView) findViewById(R.id.file_list);
mList.setOnItemClickListener(clickListener);
mReturn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String returnStr = mReturn.getText().toString();
if (mReturnPath.length() > 0 && returnStr.equals("返回上一级")) {
initList(mReturnPath);
}
}
});
initList("/"); //初始化从根目录开始
}
private void initList(String path) {
File file = new File(path);
File[] fileList = file.listFiles();
infos = new ArrayList<Map<String, Object>>();
Map<String, Object> item = new HashMap<String, Object>();
Drawable drawable;
if (path.equals("/")) { //如果当前为根目录,返回上一级按钮，不显示
drawable = getResources().getDrawable(R.drawable.versionup);
drawable.setBounds(0, 0, drawable.getMinimumWidth(),
drawable.getMinimumHeight());
mCurrentPath.setCompoundDrawablePadding(10);
mCurrentPath.setCompoundDrawables(drawable, null, null, null);
mCurrentPath.setText("根目录列表");
mReturnh.setVisibility(View.GONE);
mPathLine.setVisibility(View.GONE);
} else {
drawable = getResources().getDrawable(R.drawable.versionup);
drawable.setBounds(0, 0, drawable.getMinimumWidth(),
drawable.getMinimumHeight());
mReturn.setCompoundDrawables(drawable, null, null, null);
mReturn.setText("返回上一级");
mReturnPath = file.getParent(); //保存该级目录的上一级路径
mCurrentPath.setVisibility(View.VISIBLE);
mPathLine.setVisibility(View.VISIBLE);
mCurrentPath.setText(file.getPath());
}
try {
for (int i = 0; i < fileList.length; i++) {
item = new HashMap<String, Object>();
File fileItem = fileList[i];
if (fileItem.isDirectory()) { //如果当前文件为文件夹，设置文件夹的图标
item.put("icon", R.drawable.icon_one);
} else
item.put("icon", R.drawable.icon_two);
item.put("name", fileItem.getName());
item.put("path", fileItem.getAbsolutePath());
infos.add(item);
}
} catch (Exception e) {
e.printStackTrace();
}
adapter = new FileManagerAdapter(this);
adapter.setFileListInfo(infos);
mList.setAdapter(adapter);
}
private OnItemClickListener clickListener = new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
File file = new File((String) (infos.get(position).get("path")));
if (file.isDirectory()) { //若点击文件夹，则进入下一级目录
String nextPath = (String) (infos.get(position).get("path"));
initList(nextPath);
} else { //若点击文件，则将文件名发送至调用文件浏览器的主界面
Intent intent = new Intent();
intent.setClass(FileManagerActivity.this,
A.class);
intent.putExtra("fileName",
(String) (infos.get(position).get("name")));
intent.putExtra("path", (String) (infos.get(position).get("path")));
setResult(RESULT_OK, intent);
finish();
}
}
};
}
文件浏览器的adapter
public class FileManagerAdapter extends BaseAdapter{
private Context mContext;
private List<Map<String, Object>> list = new ArrayList<Map<String,Object>>();
public FileManagerAdapter(Context context) {
super();
mContext = context;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int arg0) {
return arg0;
}
@Override
public View getView(int position, View convertView, ViewGroup arg2) {
FileMangerHolder holder;
if(null == convertView){
holder = new FileMangerHolder();
convertView = LayoutInflater.from(mContext).inflate(R.layout.file_item, null);
holder.icon = (ImageView) convertView.findViewById(R.id.file_item_icon);
holder.name = (TextView) convertView.findViewById(R.id.file_item_name);
convertView.setTag(holder);
}else{
holder = (FileMangerHolder) convertView.getTag();
}
holder.icon.setImageResource((Integer)(list.get(position).get("icon")));
holder.name.setText((String)(list.get(position).get("name")));
return convertView;
}
public class FileMangerHolder{
public ImageView icon;
public TextView name;
}
public void setFileListInfo(List<Map<String, Object>> infos){
list.clear();
list.addAll(infos);
notifyDataSetChanged();
}
}
file_list.layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/black" android:orientation="vertical" > <TextView android:id="@+id/file_path" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="5dp" android:textColor="@color/white" android:textSize="12sp" /> <View android:id="@+id/file_path_line" android:layout_width="match_parent" android:layout_height="0.3dp" android:background="@color/gray_dark" /> <TextView android:id="@+id/file_return" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="5dp" android:textColor="@color/white" android:textSize="12sp" /> <View android:layout_width="match_parent" android:layout_height="0.3dp" android:background="@color/gray_dark" /> <ListView android:id="@+id/file_list" android:layout_width="match_parent" android:layout_height="wrap_content" android:cacheColorHint="@color/transparent" android:divider="@color/gray_dark" android:dividerHeight="0.3dp" android:listSelector="@null" android:scrollbars="none" /> </LinearLayout>
file_item.layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_vertical" android:orientation="horizontal" > <ImageView android:id="@+id/file_item_icon" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="5dp" /> <TextView android:id="@+id/file_item_name" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_margin="5dp" android:layout_weight="1" android:textColor="@color/white" android:textSize="12sp" /> </LinearLayout>
Android 文件浏览器总结
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