从列表视图删除SD卡上的文件 [英] Delete file on sd card from a listview
本文介绍了从列表视图删除SD卡上的文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
要允许用户删除他们不再想要的文件，我有一个列表视图显示的文件位于SD卡上的目录列表。我现在需要找到一种方法来检索每个文件的路径，不知它在列表视图链接到它的各个项目，并让用户删除该文件。我做了弹出当一个项目是长期点击一个对话框;我现在需要删除SD卡上的文件的人$ P $后psses确定按钮。这些文件在不同的活动中的所有创建的，所以我假设的东西都将通过一个意图传递。
ReadFilesFromDirectory.java
公共类ReadFilesFromPath延伸活动{
/ **当第一次创建活动调用。 * /
清单＆LT;串GT; myList中;
档案文件;
ListView控件列表视图;
ArrayAdapter＆LT;串GT;适配器;
字符串值;
@覆盖
公共无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.recordinglist）;
意向意图= getIntent（）;
值= intent.getStringExtra（路径）; //如果它是一个字符串，你保存。
列表视图=（ListView控件）findViewById（R.id.recordlist）;
myList中=新的ArrayList＆LT;串GT;（）;
onitemclick（）;
文件目录= Environment.getExternalStorageDirectory（）;
文件=新的文件（目录+/+记录）;
文件列表[] = file.listFiles（）; 的for（int i = 0; I＆LT; List.length的数字，我++）
{
myList.add（名单[I] .getName（））;
}
适配器=新ArrayAdapter＆LT;串GT;（这一点，
android.R.layout.simple_list_item_1，android.R.id.text1，myList中）;
listview.setAdapter（适配器）; //设置所有的文件在列表中。
longclick（）;
} 公共无效longclick（）{
listview.setOnItemLongClickListener（新AdapterView.OnItemLongClickListener（）{ 公共布尔onItemLongClick（适配器视图＆LT;＆GT;为arg0，视图V，
INT POS，长ARG3）{
AlertDialog.Builder ADB =新AlertDialog.Builder（ReadFilesFromPath.this）; //每次警报的项目是pressed
adb.setTitle（删除？）;
adb.setMessage（你确定要删除这个记录？）;
最终诠释positionToRemove = POS;
adb.setNegativeButton（取消，NULL）;
adb.setPositiveButton（OK，新AlertDialog.OnClickListener（）{ 公共无效的onClick（DialogInterface对话，诠释它）{
listview.animate（）。setDuration（500）阿尔法（0）//动画光滑删除动画
.withEndAction（新的Runnable（）{
@覆盖
公共无效的run（）{ //此处删除文件 Toast.makeText（getApplicationContext（）已删除，Toast.LENGTH_SHORT）.show（）;
myList.remove（positionToRemove）; //删除所选项目
adapter.notifyDataSetChanged（）; //告诉适配器将其删除
listview.setAlpha（1）;
}
}）;
}}）;
adb.show（）;
返回true;
}
}）; }公共无效onitemclick（）{ listview.setOnItemClickListener（新AdapterView.OnItemClickListener（）{ @覆盖
公共无效onItemClick（适配器视图＆LT;＆GT;母公司，最终视图来看，
INT位置，长的id）{
}
}）;}@覆盖
公共无效onBack pressed（）{
// TODO自动生成方法存根
super.onBack pressed（）;
overridePendingTransition（R.anim.push_right_in，R.anim.push_right_out）;
}}
我保存在这样的不同的活动中的文件中的数据（有类中更多的方法，但它们不影响文件的保存）：
公共类MainActivity延伸活动{MediaRecorder记录;
文件的AudioFile = NULL，文件，目录;
私有静态最后弦乐TAG =SoundRecordingActivity;
按钮startButton，STOPBUTTON，openFiles散，recordingbtn，删除，aboutbtn，exitbtn;
TextView的welcometext;
SimpleDateFormat的DF;
串formattedDate，名称，价值，pathToExternalStorage;
的String [] toastMessages;
文件appDirectory，filetodelete;
INT randomMsgIndex，数量;
复选框MP4;
ContentValues值;
乌里基地，newUri;
布尔recordingstarted;
清单＆LT;串GT; myList中;
ListView控件列表视图;
ArrayAdapter＆LT;串GT;适配器;
私人MenuDrawer mDrawer;
@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
//setContentView(R.layout.activity_main）;
mDrawer = MenuDrawer.attach（这一点，Position.BOTTOM）;
mDrawer.setContentView（R.layout.activity_main）;
mDrawer.setMenuView（R.layout.leftmenu）;
日历C = Calendar.getInstance（）;
DF =新的SimpleDateFormat（HH：MM：SS）;
formattedDate = df.format（c.getTime（））;
NAME =录制;
列表视图=（ListView控件）findViewById（R.id.recordlist）;
exitbtn =（按钮）findViewById（R.id.exitbtn）;
openFiles散=（按钮）findViewById（R.id.openfilesbtn）;
aboutbtn =（按钮）findViewById（R.id.aboutbtn）;
startButton =（按钮）findViewById（R.id.start）; STOPBUTTON =（按钮）findViewById（R.id.stop）;
。pathToExternalStorage = Environment.getExternalStorageDirectory（）的toString（）;
appDirectory =新的文件（pathToExternalStorage +/+Recordify）; 字体myTypeface = Typeface.createFromAsset（getAssets（），字体/ robothin.ttf）;
welcometext =（的TextView）findViewById（R.id.welcomeandtimetext）;
welcometext.setTypeface（myTypeface）;
onclicks（）;
startandstop（）;}
保护无效addRecordingToMediaLibrary（）{
值=新ContentValues（4）;
values.put（MediaStore.Audio.Media.TITLE，名）; //音频+ audiofile.getName（）
values.put（MediaStore.Audio.Media.MIME_TYPE，视频/ MP4）; //设置类型是一个MP4的视频文件，尽管是音频
values.put（MediaStore.Audio.Media.DATA，audiofile.getAbsolutePath（））;
ContentResolver的ContentResolver的= getContentResolver（）;
基地= MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
newUri = contentResolver.insert（基地，价值观）;
sendBroadcast（新意图（Intent.ACTION_MEDIA_SCANNER_SCAN_FILE，newUri））;
welcometext.setText（保存为+ audiofile的）; //特灵叫什么名字文件的用户
}
解决方案
最后一个对话框deleteDialog =新的对话框（Record.this）;
deleteDialog.requestWindowFeature（Window.FEATURE_NO_TITLE）;
deleteDialog.setContentView（R.layout.newdeletedialog）;
TextView的文本1 =（TextView中）deleteDialog
.findViewById（R.id.textValue）;
字体TF1 = Typeface.createFromAsset（getAssets（）
字体/的Roboto-Regular.ttf）;
text1.setTypeface（TF1）; 按钮deleteok =（按钮）deleteDialog
.findViewById（R.id.deleteOk）;
按钮deletecancel =（按钮）deleteDialog
.findViewById（R.id.deleteCancel）;
deleteok.setOnClickListener（新View.OnClickListener（）{ @覆盖
公共无效的onClick（查看为arg0）{
// TODO自动生成方法存根
delete.setBackgroundResource（R.drawable.delete）;
的String [] = _file新的String [] {};
的String [] =删除新的String [] {};
文件BASEDIR =环境
.getExternalStorageDirectory（）; 的for（int i = 0; I＆LT; checkItem.size（）;我++）{
删除= checkItem.toArray（新的String [checkItem
。尺寸（）]）; }
对于（INT K = 0; K＆LT; _recordList.size（）; K ++）{
_file = _recordList.toArray（新的String [_recordList
。尺寸（）]）;
}
对于（INT J = 0; J＆LT; _file.length; J ++）{
dbuser.open（）;
dbuser.DeleteItem（_file [J]）;
dbuser.close（）;
}
为（int类型l = 0; L＆下; _file.length：L ++）{ 尝试{
_file [1] = BASEDIR +/录音/+ _file [L] （_file [L]）datadelete;
}赶上（FileNotFoundException异常五）{
// TODO自动生成catch块
e.printStackTrace（）;
}
}
公共无效datadelete（字符串inputPath）抛出FileNotFoundException异常{
尝试{
//删除原始文件
新的文件（inputPath）.delete（）; }赶上（例外五）{
Log.e（标签，e.getMessage（））;
}
}
To let users delete files they no longer want, I have a listview that shows a list of files in a directory located on the SD card. I now need to find a way to retrieve the path of each file, somehow link it to it's respective item in the listview and let the user delete the file. I've made a dialog box that pops up when an item is long-clicked; I now need to delete the file on the SD card after the person presses the "OK" button. The files are all created in a different activity, so I'm assuming something will have to be passed via an intent.
ReadFilesFromDirectory.java
public class ReadFilesFromPath extends Activity {
/** Called when the activity is first created. */
List<String> myList;
File file;
ListView listview;
ArrayAdapter<String> adapter;
String value;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.recordinglist);
Intent intent = getIntent();
value = intent.getStringExtra("path"); //if it's a string you stored.
listview = (ListView) findViewById(R.id.recordlist);
myList = new ArrayList<String>();
onitemclick();
File directory = Environment.getExternalStorageDirectory();
file = new File( directory + "/" + "Recordings" );
File list[] = file.listFiles();
for( int i=0; i< list.length; i++)
{
myList.add( list[i].getName() );
}
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, android.R.id.text1, myList);
listview.setAdapter(adapter); //Set all the file in the list.
longclick();
}
public void longclick() {
listview.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> arg0, View v,
int pos, long arg3) {
AlertDialog.Builder adb=new AlertDialog.Builder(ReadFilesFromPath.this); //alert for each time an item is pressed
adb.setTitle("Delete?");
adb.setMessage("Are you sure you want to delete this recording?");
final int positionToRemove = pos;
adb.setNegativeButton("Cancel", null);
adb.setPositiveButton("Ok", new AlertDialog.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
listview.animate().setDuration(500).alpha(0) //animates a smooth deletion animation
.withEndAction(new Runnable() {
@Override
public void run() {
//DELETE THE FILE HERE
Toast.makeText(getApplicationContext(), "Deleted", Toast.LENGTH_SHORT).show();
myList.remove(positionToRemove); //removes the selected item
adapter.notifyDataSetChanged(); //tells the adapter to delete it
listview.setAlpha(1);
}
});
}});
adb.show();
return true;
}
});
}
public void onitemclick() {
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, final View view,
int position, long id) {
}
});
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
super.onBackPressed();
overridePendingTransition(R.anim.push_right_in, R.anim.push_right_out);
}
}
I save the data for the files in a different activity like this (there are more methods in the class, but they don't affect the saving of files):
public class MainActivity extends Activity {
MediaRecorder recorder;
File audiofile = null, file, directory;
private static final String TAG = "SoundRecordingActivity";
Button startButton, stopButton, openfiles, recordingbtn, delete, aboutbtn, exitbtn;
TextView welcometext;
SimpleDateFormat df;
String formattedDate, name, value, pathToExternalStorage;
String[] toastMessages;
File appDirectory, filetodelete;
int randomMsgIndex, number;
CheckBox mp4;
ContentValues values;
Uri base, newUri;
Boolean recordingstarted;
List<String> myList;
ListView listview;
ArrayAdapter<String> adapter;
private MenuDrawer mDrawer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
mDrawer = MenuDrawer.attach(this, Position.BOTTOM);
mDrawer.setContentView(R.layout.activity_main);
mDrawer.setMenuView(R.layout.leftmenu);
Calendar c = Calendar.getInstance();
df = new SimpleDateFormat("hh:mm:ss");
formattedDate = df.format(c.getTime());
name = "Recording";
listview = (ListView)findViewById(R.id.recordlist);
exitbtn = (Button)findViewById(R.id.exitbtn);
openfiles = (Button)findViewById(R.id.openfilesbtn);
aboutbtn = (Button)findViewById(R.id.aboutbtn);
startButton = (Button) findViewById(R.id.start);
stopButton = (Button) findViewById(R.id.stop);
pathToExternalStorage = Environment.getExternalStorageDirectory().toString();
appDirectory = new File(pathToExternalStorage + "/" + "Recordify");
Typeface myTypeface = Typeface.createFromAsset(getAssets(), "fonts/robothin.ttf");
welcometext = (TextView)findViewById(R.id.welcomeandtimetext);
welcometext.setTypeface(myTypeface);
onclicks();
startandstop();
}
protected void addRecordingToMediaLibrary() {
values = new ContentValues(4);
values.put(MediaStore.Audio.Media.TITLE, name); //"audio" + audiofile.getName()
values.put(MediaStore.Audio.Media.MIME_TYPE, "video/mp4"); //sets the type to be a mp4 video file, despite being audio
values.put(MediaStore.Audio.Media.DATA, audiofile.getAbsolutePath());
ContentResolver contentResolver = getContentResolver();
base = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
newUri = contentResolver.insert(base, values);
sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, newUri));
welcometext.setText("Saved as " + audiofile); //teling users what name of file is called
}
解决方案
final Dialog deleteDialog = new Dialog(Record.this);
deleteDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
deleteDialog.setContentView(R.layout.newdeletedialog);
TextView text1 = (TextView) deleteDialog
.findViewById(R.id.textValue);
Typeface tf1 = Typeface.createFromAsset(getAssets(),
"fonts/Roboto-Regular.ttf");
text1.setTypeface(tf1);
Button deleteok = (Button) deleteDialog
.findViewById(R.id.deleteOk);
Button deletecancel = (Button) deleteDialog
.findViewById(R.id.deleteCancel);
deleteok.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
delete.setBackgroundResource(R.drawable.delete);
String[] _file = new String[] {};
String[] deleted = new String[] {};
File baseDir = Environment
.getExternalStorageDirectory();
for (int i = 0; i < checkItem.size(); i++) {
deleted = checkItem.toArray(new String[checkItem
.size()]);
}
for (int k = 0; k < _recordList.size(); k++) {
_file = _recordList.toArray(new String[_recordList
.size()]);
}
for (int j = 0; j < _file.length; j++) {
dbuser.open();
dbuser.DeleteItem(_file[j]);
dbuser.close();
}
for (int l = 0; l < _file.length; l++) {
try {
_file[l] = baseDir + "/Recording/" + _file[l];
datadelete(_file[l]);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void datadelete(String inputPath) throws FileNotFoundException {
try {
// delete the original file
new File(inputPath).delete();
} catch (Exception e) {
Log.e("tag", e.getMessage());
}
}
这篇关于从列表视图删除SD卡上的文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
