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我點擊它時無法打開文本文件我的程序轉到開始頁面。我看到許多代碼 您在哪裏知道文本文件的確切位置，但我不知道它的確切位置時如何打開文本文件。如何在列表視圖中單擊時打開文本文件
其中包含3個按鍵，當我按下瀏覽按鈕的應用程序在手機打開所有文件package com.example.fileexplorerb;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener{
private static final int REQUEST_PATH = 1;
Button browseButton;
Button exitButton;
Button nextButton;
String curFileName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
browseButton = (Button)findViewById(R.id.button1);
browseButton.setOnClickListener(this);
exitButton = (Button)findViewById(R.id.button2);
exitButton.setOnClickListener(this);
nextButton= (Button)findViewById(R.id.button3);
nextButton.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
protected void onActivityResult(int requestCode, int resultCode, Intent data){
// See which child activity is calling us back.
if (requestCode == REQUEST_PATH){
if (resultCode == RESULT_OK) {
curFileName = data.getStringExtra("GetFileName");
//edittext.setText(curFileName);
}
}
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.button1){
Intent intent1 = new Intent(this, FileChooser.class);
startActivityForResult(intent1,REQUEST_PATH);
}
if (v.getId() == R.id.button2){
finish();
}
if (v.getId() == R.id.button3){
//Intent intent2 = new Intent(this, FileChooser.class);
//startActivityForResult(intent2,REQUEST_PATH);
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setType("application/txt");
startActivity(intent);
}
}
}
文件ArrayAdapter顯示文件大小，創建日期時
主要活動的Open XML和名稱
package com.example.fileexplorerb;
import java.util.List;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class FileArrayAdapter extends ArrayAdapter<Item>{
private Context c;
private int id;
private List<Item>items;
public FileArrayAdapter(Context context, int textViewResourceId,
List<Item> objects) {
super(context, textViewResourceId, objects);
c = context;
id = textViewResourceId;
items = objects;
}
public Item getItem(int i)
{
return items.get(i);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
if (v == null) {
LayoutInflater vi = (LayoutInflater)c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(id, null);
}
/* create a new view of my layout and inflate it in the row */
//convertView = (RelativeLayout) inflater.inflate(resource, null);
final Item o = items.get(position);
if (o != null) {
TextView t1 = (TextView) v.findViewById(R.id.textView1);
TextView t2 = (TextView) v.findViewById(R.id.textView2);
TextView t3 = (TextView) v.findViewById(R.id.textView3);
/* Take the ImageView from layout and set the city's image */
ImageView imageCity = (ImageView) v.findViewById(R.id.imageView1);
String uri = "drawable/" + o.getImage();
int imageResource = c.getResources().getIdentifier(uri, null, c.getPackageName());
Drawable image = c.getResources().getDrawable(imageResource);
imageCity.setImageDrawable(image);
if(t1!=null)
t1.setText(o.getName());
if(t2!=null)
t2.setText(o.getData());
if(t3!=null)
t3.setText(o.getDate());
}
return v;
}
}
FileChooser將圖像設置爲文件並且
package com.example.fileexplorerb;
import java.io.File;
import java.sql.Date;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.text.DateFormat;
import android.os.Bundle;
import android.app.ListActivity;
import android.content.Intent;
import android.view.View;
import android.widget.ListView;
public class FileChooser extends ListActivity {
private File currentDir;
private FileArrayAdapter adapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
currentDir = new File("/sdcard/");
fill(currentDir);
}
private void fill(File f)
{
File[]dirs = f.listFiles();
this.setTitle("Current Dir: "+f.getName());
List<Item>dir = new ArrayList<Item>();
List<Item>fls = new ArrayList<Item>();
try{
for(File ff: dirs)
{
Date lastModDate = new Date(ff.lastModified());
DateFormat formater = DateFormat.getDateTimeInstance();
String date_modify = formater.format(lastModDate);
if(ff.isDirectory()){
File[] fbuf = ff.listFiles();
int buf = 0;
if(fbuf != null){
buf = fbuf.length;
}
else buf = 0;
String num_item = String.valueOf(buf);
if(buf == 0) num_item = num_item + " item";
else num_item = num_item + " items";
//String formated = lastModDate.toString();
dir.add(new Item(ff.getName(),num_item,date_modify,ff.getAbsolutePath(),"directory_icon"));
}
else
{
fls.add(new Item(ff.getName(),ff.length() + " Byte", date_modify, ff.getAbsolutePath(),"file_icon"));
}
}
}catch(Exception e){
}
Collections.sort(dir);
Collections.sort(fls);
dir.addAll(fls);
if(!f.getName().equalsIgnoreCase("sdcard"))
dir.add(0,new Item("..","Parent Directory","",f.getParent(),"directory_up"));
adapter = new FileArrayAdapter(FileChooser.this,R.layout.file_view,dir);
this.setListAdapter(adapter);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
Item o = adapter.getItem(position);
if(o.getImage().equalsIgnoreCase("directory_icon")||o.getImage().equalsIgnoreCase("directory_up")){
currentDir = new File(o.getPath());
fill(currentDir);
}
else
{
onFileClick(o);
}
}
private void onFileClick(Item o)
{
//Toast.makeText(this, "Folder Clicked: "+ currentDir, Toast.LENGTH_SHORT).show();
Intent intent = new Intent();
intent.putExtra("GetPath",currentDir.toString());
intent.putExtra("GetFileName",o.getName());
setResult(RESULT_OK, intent);
finish();
}
}
XML for main activity shows main menu when you open application
<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="142dp"
android:text="Browse" />
<Button
android:id="@+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button1"
android:layout_alignTop="@+id/button1"
android:layout_marginTop="63dp"
android:text="Exit" />
<Button
android:id="@+id/button3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button2"
android:layout_below="@+id/button2"
android:layout_marginTop="14dp"
android:text="Next" />
</RelativeLayout>
file_view XML shows al l手機中的文件
file view
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="50dip"
android:layout_height="50dip" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/textView2"
android:layout_marginLeft="36dp"
android:layout_toRightOf="@+id/imageView1"
android:text="TextView" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/imageView1"
android:layout_alignLeft="@+id/textView1"
android:text="TextView" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/textView2"
android:layout_alignBottom="@+id/textView2"
android:layout_alignParentRight="true"
android:layout_marginRight="19dp"
android:text="TextView" />
</RelativeLayout>