今天复习一下ListView实现安卓文件管理器，包括文件的筛选、apk的安装，以及BaseAdapter的应用等。
直接上代码：
- 应用实现部分
public class MainActivity extends ListActivity {
private static final String ROOT_PATH = "/storage/sdcard1/tencent"; // 存储文件名称
private ArrayList<String> names = null; // 存储文件路径
private ArrayList<String> paths = null;
private ArrayList<String> states = null;
private View view;
private EditText editText;
private String[] menu;
String packageName = null;
String className = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main); // 显示文件列表
showFileDir(ROOT_PATH);
}
private void showFileDir(String path) {
names = new ArrayList<String>();
paths = new ArrayList<String>();
states = new ArrayList<String>();
File file = new File(path);
File[] files = file.listFiles();
if (!ROOT_PATH.equals(path)) {// 如果当前目录不是根目录
names.add("@1");
paths.add(ROOT_PATH);
states.add("");
names.add("@2");
paths.add(file.getParent());
states.add("");
}
if(files!=null)
for (File f : files) {// 添加所有文件
if (f.getName().indexOf(".apk") > -1) {//此处用来筛选文件，可以专门写一个接口
if (ifApkInstall(f)) {
states.add(KeyStringConst.APK_HASINSTALL);
} else {
states.add(KeyStringConst.APK_NOINSTALL);
}
names.add(f.getName());
paths.add(f.getPath());
} else if (f.isDirectory()) {
names.add(f.getName());
paths.add(f.getPath());
states.add("");
} else {// 普通文件
names.add(f.getName());
paths.add(f.getPath());
states.add("");
}
}
this.setListAdapter(new MyAdapter(this, names, paths, states));
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
String path = paths.get(position);
File file = new File(path); // 文件存在并可读
if (file.exists() && file.canRead()) {
if (file.isDirectory()) { // 显示子目录及文件
showFileDir(path);
} else { // 处理文件
fileHandle(file);
}
} else {// 没有权限
Resources res = getResources();
new AlertDialog.Builder(this).setTitle("Message")
.setMessage(res.getString(R.string.no_permission))
.setPositiveButton("OK", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
}).show();
}
super.onListItemClick(l, v, position, id);
}
// 对文件进行增删改
private void fileHandle(final File file) {
String dialogTitle = "";
OnClickListener listener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// 打开文件
if (which == 0) {
if (menu[0].equals(KeyStringConst.OPEN_FILE)) {// 打开文件
openFile(file);
} else if (menu[0].equals(KeyStringConst.OPEN_APP)) {// 打开应用
Intent intent = getPackageManager()
.getLaunchIntentForPackage(packageName);
startActivity(intent);
finish();
} else if (menu[0].equals(KeyStringConst.INSTALL_APK)) {//安装apk
Intent intent = new Intent();
// 设置目标应用安装包路径
intent.setDataAndType(Uri.fromFile(file),
"application/vnd.android.package-archive");
startActivity(intent);
}
} else if (which == 1) {
// 修改文件名
LayoutInflater factory = LayoutInflater
.from(MainActivity.this);
view = factory.inflate(R.layout.rename_dialog, null);
editText = (EditText) view.findViewById(R.id.editText);
editText.setText(file.getName());
OnClickListener listener2 = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
String modifyName = editText.getText().toString();
final String fpath = file.getParentFile().getPath();
final File newFile = new File(fpath + "/"
+ modifyName);
if (newFile.exists()) {
// 排除没有修改情况
if (!modifyName.equals(file.getName())) {
new AlertDialog.Builder(MainActivity.this)
.setTitle("注意!")
.setMessage("文件名已存在，是否覆盖？")
.setPositiveButton(
"确定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(
DialogInterface dialog,
int which) {
if (file.renameTo(newFile)) {
showFileDir(fpath);
displayToast("重命名成功！");
} else {
displayToast("重命名失败！");
}
}
})
.setNegativeButton(
"取消",
new DialogInterface.OnClickListener() {
@Override
public void onClick(
DialogInterface dialog,
int which) {
}
}).show();
}
} else {
if (file.renameTo(newFile)) {
showFileDir(fpath);
displayToast("重命名成功！");
} else {
displayToast("重命名失败！");
}
}
}
};
AlertDialog renameDialog = new AlertDialog.Builder(
MainActivity.this).create();
renameDialog.setView(view);
renameDialog.setButton(DialogInterface.BUTTON_POSITIVE,
"确定", listener2);
renameDialog.setButton(DialogInterface.BUTTON_NEGATIVE,
"取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
}
});
renameDialog.show();
} else {
// 删除文件
new AlertDialog.Builder(MainActivity.this)
.setTitle("注意!")
.setMessage("确定要删除此文件吗？")
.setPositiveButton("确定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(
DialogInterface dialog,
int which) {
if (file.delete()) {
// 更新文件列表
showFileDir(file.getParent());
displayToast("删除成功！");
} else {
displayToast("删除失败！");
}
}
})
.setNegativeButton("取消",
new DialogInterface.OnClickListener() {
@Override
public void onClick(
DialogInterface dialog,
int which) {
}
}).show();
}
}
};
// 选择文件时，弹出增删该操作选项对话框
menu = new String[3];
if (file.getName().indexOf(".apk") > -1) {
if (ifApkInstall(file)) {
menu[0] = KeyStringConst.OPEN_APP;
menu[1] = KeyStringConst.RENAME_FILE;
menu[2] = KeyStringConst.DELETE_FILE;
dialogTitle = "该应用已安装，";
} else {
menu[0] = KeyStringConst.INSTALL_APK;
menu[1] = KeyStringConst.RENAME_FILE;
menu[2] = KeyStringConst.DELETE_FILE;
dialogTitle = "该文件为安装包，";
}
} else {
menu[0] = KeyStringConst.OPEN_FILE;
menu[1] = KeyStringConst.RENAME_FILE;
menu[2] = KeyStringConst.DELETE_FILE;
dialogTitle = "普通文件，";
}
new AlertDialog.Builder(MainActivity.this)
.setTitle(dialogTitle + "请选择您要进行的操作!").setItems(menu, listener)
.setPositiveButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
}).show();
}
public boolean ifApkInstall(File file) {
boolean ifApkInstall = false;
String ppackageName = null;
ArrayList<AppInfo> appInfos = getAppList();
PackageManager pm = this.getPackageManager();
PackageInfo info = pm.getPackageArchiveInfo(file.getAbsolutePath(),
PackageManager.GET_ACTIVITIES);
ApplicationInfo appInfo = null;
if (info != null) {
appInfo = info.applicationInfo;
ppackageName = appInfo.packageName;
className = appInfo.className;
}
for (int i = 0; i < appInfos.size(); i++) {
if (appInfos.get(i).packagename.equals(ppackageName)) {
packageName = appInfos.get(i).packagename;
className = appInfos.get(i).classname;
ifApkInstall = true;
break;
}
}
return ifApkInstall;
}
/**
* 获取非系统应用信息列表
*/
private ArrayList<AppInfo> getAppList() {
ArrayList<AppInfo> appList = new ArrayList<AppInfo>();
PackageManager pm = this.getPackageManager();
// Return a List of all packages that are installed on the device.
List<PackageInfo> packages = pm.getInstalledPackages(0);
for (PackageInfo packageInfo : packages) {
// 判断系统/非系统应用
// if ((packageInfo.applicationInfo.flags &
// ApplicationInfo.FLAG_SYSTEM) <= 0) //判断是否为非系统预装的应用程序 ==0是非系统应用
// {
AppInfo tmpInfo = new AppInfo();
tmpInfo.appname = packageInfo.applicationInfo.loadLabel(
getPackageManager()).toString();
// The name of this package. From the <manifest> tag's "name"
// attribute.
tmpInfo.packagename = packageInfo.applicationInfo.packageName;
// The version name of this package, as specified by the <manifest>
// tag's versionName attribute.
tmpInfo.versionName = packageInfo.versionName;
// The version number of this package, as specified by the
// <manifest> tag's versionCode attribute.
tmpInfo.versionCode = packageInfo.versionCode;
// Class implementing the Application object. From the "class"
// attribute.
tmpInfo.classname = packageInfo.applicationInfo.className;
// Log.i("MainActivity activities", tmpInfo.activitys.toString());
// tmpInfo.appicon =
// packageInfo.applicationInfo.loadIcon(getPackageManager());
appList.add(tmpInfo);
// }
}
return appList;
}
protected class AppInfo {
protected int versionCode = 0; // 名称
protected String appname = ""; // 包
protected String packagename = "";
protected String classname = "";
protected String versionName = ""; // 图标
}
// 打开文件
private void openFile(File file) {
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);
String type = getMIMEType(file);
intent.setDataAndType(Uri.fromFile(file), type);
startActivity(intent);
}
// 获取文件mimetype
private String getMIMEType(File file) {
String type = "";
String name = file.getName();
// 文件扩展名
String end = name.substring(name.lastIndexOf(".") + 1, name.length())
.toLowerCase();
if (end.equals("m4a") || end.equals("mp3") || end.equals("wav")) {
type = "audio";
} else if (end.equals("mp4") || end.equals("3gp")) {
type = "video";
} else if (end.equals("jpg") || end.equals("png") || end.equals("jpeg")
|| end.equals("bmp") || end.equals("gif")) {
type = "image";
} else {
// 如果无法直接打开，跳出列表由用户选择
type = "*";
}
type += "/*";
return type;
}
private void displayToast(String message) {
Toast.makeText(MainActivity.this, message, Toast.LENGTH_SHORT).show();
}
}<>
- Adapter实现部分
这里说一下为什么要用BaseAdapter（抽象类），BaseAdapter的灵活性就在于它要重写很多方法。只要实现了对一个控件（如本文中的ListView）数据的适配，那其它的只需要稍作修改就可以用到别如GridView等上：
1.BaseAdapter也是Android应用程序中经常用到的基础数据适配器，它的主要用途是将一组数据传到像ListView、Spinner、Gallery及GridView等UI显示组件，它是继承自接口类Adapter，自定义Adapter子类，就需要实现上面几个方法，其中最重要的是getView()方法，它是将获取数据后的View组件返回，如ListView中每一行里的TextView、Gallery等中的每个ImageView。
2.Adapter在Android应用程序中起着非常重要的作用，应用也非常广泛，它可看作是数据源和UI组件之间的桥梁，其中Adapter、数据和UI之间的关系，可以用下图表示：
-
３.Adapter的常用子类，如下图：
- 代码如下：
public class MyAdapter extends BaseAdapter {
private LayoutInflater inflater;
private Bitmap directory, file;
// 存储文件名称
private ArrayList<String> names = null;
// 存储文件路径
private ArrayList<String> paths = null;
// 存储文件路径
private ArrayList<String> states = null;
// 参数初始化
public MyAdapter(Context context, ArrayList<String> name,
ArrayList<String> path, ArrayList<String> state) {
names = name;
paths = path;
states = state;
directory = BitmapFactory.decodeResource(context.getResources(),
R.drawable.directory);
file = BitmapFactory.decodeResource(context.getResources(),
R.drawable.file);
// 缩小图片
directory = small(directory, 0.16f);
file = small(file, 0.1f);
inflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return names.size();
}
@Override
public Object getItem(int position) {
return names.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (null == convertView) {
convertView = inflater.inflate(R.layout.file, null);
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.textView);
holder.image = (ImageView) convertView.findViewById(R.id.imageView);
holder.state = (TextView) convertView.findViewById(R.id.stateView);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
File f = new File(paths.get(position).toString());
if (names.get(position).equals("@1")) {
holder.text.setText("/");
holder.image.setImageBitmap(directory);
} else if (names.get(position).equals("@2")) {
holder.text.setText("..");
holder.image.setImageBitmap(directory);
} else {
holder.text.setText(f.getName());
if (f.isDirectory()) {
holder.image.setImageBitmap(directory);
holder.state.setText(states.get(position));
} else if (f.isFile()) {
holder.image.setImageBitmap(file);
holder.state.setText(states.get(position));
} else {
System.out.println(f.getName());
}
}
return convertView;
}
private class ViewHolder {
private TextView text;
private ImageView image;
private TextView state;
}
private Bitmap small(Bitmap map, float num) {
Matrix matrix = new Matrix();
matrix.postScale(num, num);
return Bitmap.createBitmap(map, 0, 0, map.getWidth(), map.getHeight(),
matrix, true);
}
}- 界面中文字集合部分
本应该在xml中编写，但太频繁的通过getString来获取xml文件中的内容其实会慢于直接在JAVA文件中（直接在内存中取String常量，但缺点也很明显，当常量太多的时候，会有不必要数据的加载进内存，且不便于统一字符编码格式，以及国际化）：
KeyStringConst.java
public class KeyStringConst {
public static final String INSTALL_APK = "安装";
public static final String UNINSTALL_APK = "卸载";
public static final String RENAME_FILE = "重命名";
public static final String DELETE_FILE = "删除文件";
public static final String OPEN_APP = "打开";
public static final String OPEN_FILE = "打开文件";
public static final String APK_HASINSTALL = "hasinstall";
public static final String APK_NOINSTALL = "notinstall";
public static final String APK_INSTALLFAILL = "应用安装成功！";
public static final String APK_INSTALLSUCCESS = "应用安装失败！";
}- 主要布局文件部分
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ListView android:id="@android:id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>file.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_gravity="center_horizontal|bottom"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<RelativeLayout android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
>
<ImageView android:id="@+id/imageView"
android:layout_height="30dip"
android:layout_width="wrap_content"
android:layout_marginLeft="20dip">
</ImageView>
<TextView android:id="@+id/textView"
android:layout_width="600dip"
android:layout_height="30dip"
android:layout_gravity="bottom"
android:gravity="bottom"
android:singleLine="true"
android:textSize="14sp"
android:layout_marginLeft="100dip"
>
</TextView>
<TextView android:id="@+id/stateView"
android:layout_width="60dip"
android:layout_height="30dip"
android:textSize="9sp"
android:layout_gravity="bottom"
android:gravity="bottom"
android:singleLine="true"
android:layout_marginLeft="750dip"
>
</TextView>
</RelativeLayout>
</LinearLayout>现在21：46，加班快要结束了，没办法，零碎的事情太多了。客户也是这边那边都在催，这边说APP有问题要改要优化，那边又接了个新的活。
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