我使用列表视图创建了一个文件资源管理器，可以让我们查看所有存储卡文件夹和文件。现在，当我单击任何文件时，会出现一个对话框，其中提供三个选项/按钮，即隐藏、发现和取消。现在我无法从列表视图中检索文件名并更改其名称，以便文件隐藏在画廊中。我正在上传我的代码，它给出了错误无法从活动执行方法。
Java 文件包含隐藏逻辑。 onHide()和onUnhide()是隐藏和取消隐藏文件的方法
package com.example.settingspro;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import android.os.Bundle;
import android.os.Environment;
import android.app.Dialog;
import android.app.ListActivity;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class pichide extends ListActivity {
private List<String> item = null;
private List<String> path = null;
private String root;
private TextView myPath;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pichide);
myPath = (TextView)findViewById(R.id.path);
root = Environment.getExternalStorageDirectory().getPath();
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];
if(!file.isHidden() && file.canRead()) {
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.hidelistlayout, item);
setListAdapter(fileList);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id)
{
// TODO Auto-generated method stub
File file = new File(path.get(position));
if (file.isDirectory())
{
if(file.canRead())
{
getDir(path.get(position));
}
else
{
Dialog settingsDialog = new Dialog(this);
settingsDialog.setTitle("Options");
settingsDialog.setContentView(getLayoutInflater().inflate(R.layout.button_layout1, null));
settingsDialog.show();
}
}
else
{
Dialog settingsDialog = new Dialog(this);
settingsDialog.setTitle("Options");
settingsDialog.setContentView(getLayoutInflater().inflate(R.layout.button_layout1, null));
settingsDialog.show();
}
}
public void onHide(View v)
{
long id;
ListView lv = getListView();
int position = lv.getPositionForView(v);
File file = new File(path.get(position));
if (file.isDirectory())
{
if(file.canRead())
{
getDir(path.get(position));
}
else
{
String s = file.getName();
File f = new File(s);
File f1 = new File(s + ".aaa");
f.renameTo(f1);
Toast.makeText(getApplicationContext(),
"File Hidden", Toast.LENGTH_SHORT).show();
}
}
else
{
String s = file.getName();
File f = new File(s);
File f1 = new File(s + ".aaa");
f.renameTo(f1);
Toast.makeText(getApplicationContext(),
"File Hidden", Toast.LENGTH_SHORT).show();
}
}
public void onUnhide(View v)
{
long id;
ListView lv = getListView();
int position = lv.getPositionForView(v);
File file = new File(path.get(position));
if (file.isDirectory())
{
if(file.canRead())
{
getDir(path.get(position));
}
else
{
String s = file.getName();
File f = new File(s);
File f1 = new File(s);
f.renameTo(f1);
Toast.makeText(getApplicationContext(),
"File UnHidden", Toast.LENGTH_SHORT).show();
}
}
else
{
String s = file.getName();
File f = new File(s);
File f1 = new File(s);
f.renameTo(f1);
Toast.makeText(getApplicationContext(),
"File UnHidden", Toast.LENGTH_SHORT).show();
}
}
public void onBack(View v)
{
finish();
}
}
对话框Button_layout1.xml的LayoutFile
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/RelativeLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/back2"
android:orientation="vertical" >
<Button
android:id="@+id/hidebt"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:onClick="onHide"
android:text="@string/hide"
android:textColor="#ffffff"
android:textStyle="bold" />
<Button
android:id="@+id/unhidebt"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/hidebt"
android:layout_below="@+id/hidebt"
android:onClick="onUnhide"
android:text="@string/unhide"
android:textColor="#ffffff"
android:textStyle="bold" />
<Button
android:id="@+id/backbt"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/unhidebt"
android:layout_below="@+id/unhidebt"
android:onClick="onBack"
android:text="@string/back"
android:textColor="#ffffff"
android:textStyle="bold" />
</RelativeLayout>
使用 listview 的 picide.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/status_bar_background22"
android:orientation="vertical" >
<TextView
android:id="@+id/path"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#ffffff"
android:textStyle="bold" />
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView
android:id="@android:id/empty"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/nodata"
android:textColor="#ffffff"
android:textStyle="bold"
/>
</LinearLayout>
我的 ListView 项目布局 hidelistlayout.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rowtext"
android:layout_width="fill_parent"
android:layout_height="30sp"
android:textSize="25sp"
android:textColor="#ffffff"
android:textStyle="bold" />
日志：
08-29 19:14:18.572: D/AndroidRuntime(11136): Shutting down VM
08-29 19:14:18.572: W/dalvikvm(11136): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
08-29 19:14:18.602: E/AndroidRuntime(11136): FATAL EXCEPTION: main
08-29 19:14:18.602: E/AndroidRuntime(11136): java.lang.IllegalStateException: Could not execute method of the activity
08-29 19:14:18.602: E/AndroidRuntime(11136): at android.view.View$1.onClick(View.java:3599)
08-29 19:14:18.602: E/AndroidRuntime(11136): at android.view.View.performClick(View.java:4204)
08-29 19:14:18.602: E/AndroidRuntime(11136): at android.view.View$PerformClick.run(View.java:17355)
08-29 19:14:18.602: E/AndroidRuntime(11136): at android.os.Handler.handleCallback(Handler.java:725)
08-29 19:14:18.602: E/AndroidRuntime(11136): at android.os.Handler.dispatchMessage(Handler.java:92)
08-29 19:14:18.602: E/AndroidRuntime(11136): at android.os.Looper.loop(Looper.java:137)
08-29 19:14:18.602: E/AndroidRuntime(11136): at android.app.ActivityThread.main(ActivityThread.java:5041)
08-29 19:14:18.602: E/AndroidRuntime(11136): at java.lang.reflect.Method.invokeNative(Native Method)
08-29 19:14:18.602: E/AndroidRuntime(11136): at java.lang.reflect.Method.invoke(Method.java:511)
08-29 19:14:18.602: E/AndroidRuntime(11136): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
08-29 19:14:18.602: E/AndroidRuntime(11136): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
08-29 19:14:18.602: E/AndroidRuntime(11136): at dalvik.system.NativeStart.main(Native Method)
08-29 19:14:18.602: E/AndroidRuntime(11136): Caused by: java.lang.reflect.InvocationTargetException
08-29 19:14:18.602: E/AndroidRuntime(11136): at java.lang.reflect.Method.invokeNative(Native Method)
08-29 19:14:18.602: E/AndroidRuntime(11136): at java.lang.reflect.Method.invoke(Method.java:511)
08-29 19:14:18.602: E/AndroidRuntime(11136): at android.view.View$1.onClick(View.java:3594)
08-29 19:14:18.602: E/AndroidRuntime(11136): ... 11 more
08-29 19:14:18.602: E/AndroidRuntime(11136): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=12; index=-1
08-29 19:14:18.602: E/AndroidRuntime(11136): at java.util.ArrayList.get(ArrayList.java:306)
08-29 19:14:18.602: E/AndroidRuntime(11136): at com.example.settingspro.pichide.onHide(pichide.java:124)
08-29 19:14:18.602: E/AndroidRuntime(11136): ... 14 more
08-29 19:14:18.632: W/ActivityManager(315): Force finishing activity com.example.settingspro/.pichide
08-29 19:14:18.642: W/WindowManager(315): Failure taking screenshot for (123x221) to layer 21020