在Android上没有标准的打开和另存为对话框。在本代码中,我将详细描述一个非常简单的打开和保存对话框实现过程,对于Android初学者来说非常有用，对话框都是全屏活动的。
主要功能：
1、访问任何目录的SD卡
2、递归访问文件夹
3、单一文件选择
4、通过按硬件后退按钮升级
5、确认文件选择OK按钮
activity_open_file.xml
http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_ android:layout_ android:orientation="vertical" >
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 listItems = new ArrayList();
ArrayAdapter 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 folders = new ArrayList();
ArrayList files = new ArrayList();
currentPath = path;
File allEntries = new File(path).listFiles();
for (int i = 0; i () {
@Override
public int compare(String s1, String s2) {
return s1.compareToIgnoreCase(s2);
}
});
Collections.sort(files, new Comparator() {
@Override
public int compare(String s1, String s2) {
return s1.compareToIgnoreCase(s2);
}
});
listItems.clear();
for (int i = 0; i (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<&＃63;> 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)
+ "[" + entryName + "]");
}
}
}
activity_save_file.xml
http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_ android:layout_ android:orientation="vertical" >
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 listItems = new ArrayList();
ArrayAdapter 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 folders = new ArrayList();
ArrayList files = new ArrayList();
currentPath = path;
File allEntries = new File(path).listFiles();
for (int i = 0; i () {
@Override
public int compare(String s1, String s2) {
return s1.compareToIgnoreCase(s2);
}
});
Collections.sort(files, new Comparator() {
@Override
public int compare(String s1, String s2) {
return s1.compareToIgnoreCase(s2);
}
});
listItems.clear();
for (int i = 0; i (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<&＃63;> 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)
+ "[" + entryName + "]");
TxtFileName.setText(entryName);
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
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