非常簡(jiǎn)單的Android打開(kāi)和保存對(duì)話框功能
在Android上沒(méi)有標(biāo)準(zhǔn)的打開(kāi)和另存為對(duì)話框。在本代碼中,我將詳細(xì)描述一個(gè)非常簡(jiǎn)單的打開(kāi)和保存對(duì)話框?qū)崿F(xiàn)過(guò)程,對(duì)于Android初學(xué)者來(lái)說(shuō)非常有用,對(duì)話框都是全屏活動(dòng)的。
主要功能:
1、訪問(wèn)任何目錄的SD卡
2、遞歸訪問(wèn)文件夾
3、單一文件選擇
4、通過(guò)按硬件后退按鈕升級(jí)
5、確認(rèn)文件選擇OK按鈕
activity_open_file.xml
<LinearLayout xmlns:android="<a rel="nofollow" target="_blank">http://schemas.android.com/apk/res/android"</a>
xmlns:tools="<a rel="nofollow" target="_blank">http://schemas.android.com/tools"</a>
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/LvList"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1" >
</ListView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/BtnOK"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="OK" />
<Button
android:id="@+id/BtnCancel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Cancel" />
</LinearLayout>
</LinearLayout>
OpenFileActivity.java
package com.example.androidfiledialogs;
import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.Toast;
public class OpenFileActivity extends Activity
implements OnClickListener, OnItemClickListener {
ListView LvList;
ArrayList<String> listItems = new ArrayList<String>();
ArrayAdapter<String> adapter;
Button BtnOK;
Button BtnCancel;
String currentPath = null;
String selectedFilePath = null; /* Full path, i.e. /mnt/sdcard/folder/file.txt */
String selectedFileName = null; /* File Name Only, i.e file.txt */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_open_file);
try {
/* Initializing Widgets */
LvList = (ListView) findViewById(R.id.LvList);
BtnOK = (Button) findViewById(R.id.BtnOK);
BtnCancel = (Button) findViewById(R.id.BtnCancel);
/* Initializing Event Handlers */
LvList.setOnItemClickListener(this);
BtnOK.setOnClickListener(this);
BtnCancel.setOnClickListener(this);
//
setCurrentPath(Environment.getExternalStorageDirectory().getAbsolutePath() + "/");
} catch (Exception ex) {
Toast.makeText(this,
"Error in OpenFileActivity.onCreate: " + ex.getMessage(),
Toast.LENGTH_SHORT).show();
}
}
void setCurrentPath(String path) {
ArrayList<String> folders = new ArrayList<String>();
ArrayList<String> files = new ArrayList<String>();
currentPath = path;
File allEntries = new File(path).listFiles();
for (int i = 0; i < allEntries.length; i++) {
if (allEntries.isDirectory()) {
folders.add(allEntries.getName());
} else if (allEntries.isFile()) {
files.add(allEntries.getName());
}
}
Collections.sort(folders, new Comparator<String>() {
@Override
public int compare(String s1, String s2) {
return s1.compareToIgnoreCase(s2);
}
});
Collections.sort(files, new Comparator<String>() {
@Override
public int compare(String s1, String s2) {
return s1.compareToIgnoreCase(s2);
}
});
listItems.clear();
for (int i = 0; i < folders.size(); i++) {
listItems.add(folders.get(i) + "/");
}
for (int i = 0; i < files.size(); i++) {
listItems.add(files.get(i));
}
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,
listItems);
adapter.notifyDataSetChanged();
LvList.setAdapter(adapter);
}
@Override
public void onBackPressed()
{
if (!currentPath.equals(Environment.getExternalStorageDirectory().getAbsolutePath() + "/")) {
setCurrentPath(new File(currentPath).getParent() + "/");
} else {
super.onBackPressed();
}
}
@Override
public void onClick(View v) {
Intent intent;
switch (v.getId()) {
case R.id.BtnOK:
intent = new Intent();
intent.putExtra("fileName", selectedFilePath);
intent.putExtra("shortFileName", selectedFileName);
setResult(RESULT_OK, intent);
this.finish();
break;
case R.id.BtnCancel:
intent = new Intent();
intent.putExtra("fileName", "");
intent.putExtra("shortFileName", "");
setResult(RESULT_CANCELED, intent);
this.finish();
break;
}
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String entryName = (String)parent.getItemAtPosition(position);
if (entryName.endsWith("/")) {
setCurrentPath(currentPath + entryName);
} else {
selectedFilePath = currentPath + entryName;
selectedFileName = entryName;
this.setTitle(this.getResources().getString(R.string.title_activity_open_file)
+ "<span>[</span>" + entryName + "]");
}
}
}
activity_save_file.xml
<LinearLayout xmlns:android="<a rel="nofollow" target="_blank">http://schemas.android.com/apk/res/android"</a>
xmlns:tools="<a rel="nofollow" target="_blank">http://schemas.android.com/tools"</a>
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/SFA_LvList"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1" >
</ListView>
<EditText
android:id="@+id/SFA_TxtFileName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:text="file.txt" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/SFA_BtnOK"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="OK" />
<Button
android:id="@+id/SFA_BtnCancel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Cancel" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
SaveFileActivity.java
package com.example.androidfiledialogs;
import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class SaveFileActivity extends Activity
implements OnClickListener, OnItemClickListener {
ListView LvList;
ArrayList<String> listItems = new ArrayList<String>();
ArrayAdapter<String> adapter;
EditText TxtFileName;
Button BtnOK;
Button BtnCancel;
String currentPath = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_save_file);
try {
/* Initializing Widgets */
LvList = (ListView) findViewById(R.id.SFA_LvList);
TxtFileName = (EditText) findViewById(R.id.SFA_TxtFileName);
BtnOK = (Button) findViewById(R.id.SFA_BtnOK);
BtnCancel = (Button) findViewById(R.id.SFA_BtnCancel);
/* Initializing Event Handlers */
LvList.setOnItemClickListener(this);
BtnOK.setOnClickListener(this);
BtnCancel.setOnClickListener(this);
//
setCurrentPath(Environment.getExternalStorageDirectory().getAbsolutePath() + "/");
} catch (Exception ex) {
Toast.makeText(this,
"Error in SaveFileActivity.onCreate: " + ex.getMessage(),
Toast.LENGTH_SHORT).show();
}
}
void setCurrentPath(String path) {
ArrayList<String> folders = new ArrayList<String>();
ArrayList<String> files = new ArrayList<String>();
currentPath = path;
File allEntries = new File(path).listFiles();
for (int i = 0; i < allEntries.length; i++) {
if (allEntries.isDirectory()) {
folders.add(allEntries.getName());
} else if (allEntries.isFile()) {
files.add(allEntries.getName());
}
}
Collections.sort(folders, new Comparator<String>() {
@Override
public int compare(String s1, String s2) {
return s1.compareToIgnoreCase(s2);
}
});
Collections.sort(files, new Comparator<String>() {
@Override
public int compare(String s1, String s2) {
return s1.compareToIgnoreCase(s2);
}
});
listItems.clear();
for (int i = 0; i < folders.size(); i++) {
listItems.add(folders.get(i) + "/");
}
for (int i = 0; i < files.size(); i++) {
listItems.add(files.get(i));
}
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,
listItems);
adapter.notifyDataSetChanged();
LvList.setAdapter(adapter);
}
@Override
public void onBackPressed()
{
if (!currentPath.equals(Environment.getExternalStorageDirectory().getAbsolutePath() + "/")) {
setCurrentPath(new File(currentPath).getParent() + "/");
} else {
super.onBackPressed();
}
}
@Override
public void onClick(View v) {
Intent intent;
switch (v.getId()) {
case R.id.SFA_BtnOK:
intent = new Intent();
intent.putExtra("fileName", currentPath + TxtFileName.getText().toString());
intent.putExtra("shortFileName", TxtFileName.getText().toString());
setResult(RESULT_OK, intent);
this.finish();
break;
case R.id.SFA_BtnCancel:
intent = new Intent();
intent.putExtra("fileName", "");
intent.putExtra("shortFileName", "");
setResult(RESULT_CANCELED, intent);
this.finish();
break;
}
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
String entryName = (String)parent.getItemAtPosition(position);
if (entryName.endsWith("/")) {
setCurrentPath(currentPath + entryName);
} else {
this.setTitle(this.getResources().getString(R.string.title_activity_open_file)
+ "<span>[</span>" + entryName + "]");
TxtFileName.setText(entryName);
}
}
}
以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。
- Android 常見(jiàn)的四種對(duì)話框?qū)嵗v解
- Android 對(duì)話框(Dialog)大全詳解及示例代碼
- Android 對(duì)話框 Dialog使用實(shí)例講解
- Android對(duì)話框自定義標(biāo)題 對(duì)話框標(biāo)題美化操作
- 懸浮對(duì)話框Android代碼實(shí)現(xiàn)
- Android Dialog 對(duì)話框詳解及示例代碼
- Android Dialog對(duì)話框用法實(shí)例詳解
- Android UI設(shè)計(jì)系列之自定義Dialog實(shí)現(xiàn)各種風(fēng)格的對(duì)話框效果(7)
- Android中制作自定義dialog對(duì)話框的實(shí)例分享
- Android中AlertDialog各種對(duì)話框的用法實(shí)例詳解
- Android 對(duì)話框sweet-alert-dialog
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