安卓一个Activity里面写好内容跳到另外一个Activity选择文件之后回来，其他内容消失解决办法

当在Android应用中从一个Activity跳转到文件选择页面后返回，原Activity的内容消失。本文通过示例展示了如何避免这种情况，提供了一个完整的解决方案，包括布局文件和Java代码，涉及ListView、Intent和数据传递等关键部分。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

这里以选择文件为例子供大家学习：

布局文件：main.xml(主界面)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/bg4"
>
<LinearLayout android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="100dp">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:textSize="18dp"
android:textColor="@color/black"
android:text="信息标题: "/>
<EditText
android:layout_width="fill_parent"
android:layout_weight="1"
android:layout_height="40dp"
android:layout_marginRight="10dp"
android:singleLine="true"/>
</LinearLayout>
<LinearLayout android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginTop="20dp">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:textSize="18dp"
android:textColor="@color/black"
android:text="信息附件: "/>
<EditText android:id="@+id/filename"
android:layout_width="fill_parent"
android:layout_weight="1"
android:layout_height="40dp"
android:layout_marginRight="10dp"
android:focusable="false"
android:singleLine="true"/>
</LinearLayout>
<LinearLayout android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal">
<Button android:id="@+id/choosebut"
android:layout_width="70dp"
android:layout_marginTop="5dp"
android:layout_height="40dp"
android:layout_marginLeft="85dp"
android:text="浏览"/>
</LinearLayout>

</LinearLayout>

文件选择页面布局：fileselect.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FFFFFF"
android:orientation="vertical" >

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/LinearLayout1"
android:layout_marginBottom="50dp"
android:orientation="vertical" >

<TextView
android:id="@+id/mPath"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5px"
android:textColor="#386EB3"
android:textSize="18sp" >
</TextView>

<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_weight="1"
android:layout_height="fill_parent"
android:listSelector="@drawable/menu_item_bg">
</ListView>
</LinearLayout>
//android:layout_alignParentBottom="true"放在父容器的底部
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="bottom"
android:layout_alignParentBottom="true"
android:orientation="horizontal" >
<Button
android:id="@+id/buttonConfirm"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="确定"
android:textColor="@color/black" />

<Button
android:id="@+id/buttonCancle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="取消"
android:textColor="@color/black" />
</LinearLayout>

</RelativeLayout>

listview里面布局：file_row.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#ffffff"
>
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="6px"
>
<ImageView android:id="@+id/icon"
android:layout_width="30dip"
android:layout_height="30dip"
>
</ImageView>
<TextView android:id="@+id/text"
android:layout_gravity="center_horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#767676"
>
</TextView>
</LinearLayout>
</LinearLayout>

java代码：MyActivity.java

package com.example.FileExplorer;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MyActivity extends Activity {
/**
* Called when the activity is first created.
*/
private String filePath="";
private Button choosebut;
private EditText filename;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
filename=(EditText)findViewById(R.id.filename);
choosebut=(Button)findViewById(R.id.choosebut);
choosebut.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

//跳转到要去的Activity里面
Intent intent=new Intent(MyActivity.this, MyFileManagerActivity.class);
startActivityForResult(intent, 0);

}
});
}

//重写这个方法获取上个Activity里面返回来的值
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

//注意这里的20要跟你上个Activity里面传的值一样否则接不到
if(20==resultCode)
{
filePath=data.getExtras().getString("filePath");
filename.setText(filePath);
}
super.onActivityResult(requestCode, resultCode, data);
}
}

java代码：MyAdapter.java

package com.example.FileExplorer;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.io.File;
import java.util.List;

public class MyAdapter extends BaseAdapter {

private LayoutInflater mInflater;
private Bitmap mIcon1;
private Bitmap mIcon2;
private Bitmap mIcon3;
private Bitmap mIcon4;
private List<String> items;
private List<String> paths;
// public int selectedposition=com.example.FileExplorer.MyFileManagerActivity.Selectedposition;
public int selectedposition;
public MyAdapter(Context context, List<String> it, List<String> pa, int select){
this.selectedposition = select;
mInflater=LayoutInflater.from(context);
items=it;
paths=pa;
mIcon1=BitmapFactory.decodeResource(context.getResources(),R.drawable.back01);
mIcon2=BitmapFactory.decodeResource(context.getResources(),R.drawable.back02);
mIcon3=BitmapFactory.decodeResource(context.getResources(),R.drawable.folder);
mIcon4=BitmapFactory.decodeResource(context.getResources(),R.drawable.doc);
}

@Override
public int getCount() {
return items.size();
}

@Override
public Object getItem(int position) {
return items.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(convertView==null){

convertView=mInflater.inflate(R.layout.file_row,null);
holder=new ViewHolder();
holder.text=(TextView)convertView.findViewById(R.id.text);
holder.icon=(ImageView)convertView.findViewById(R.id.icon);
convertView.setTag(holder);
}else{
holder=(ViewHolder)convertView.getTag();
}
try{
File f=new File(paths.get(position).toString());

if(items.get(position).toString().equals("b1"))
{
holder.text.setText("返回根目录..");
holder.icon.setImageBitmap(mIcon1);
}
else if(items.get(position).toString().equals("b2"))
{
holder.text.setText("返回上一层..");
holder.icon.setImageBitmap(mIcon2);
}
else
{
holder.text.setText(f.getName());
if(f.isDirectory())
{
holder.icon.setImageBitmap(mIcon3);
}
else
{
holder.icon.setImageBitmap(mIcon4);
}
}
}catch (Exception e){
e.printStackTrace();
}
return convertView;
}

private class ViewHolder
{
TextView text;
ImageView icon;
}
}
java代码：MyFileManagerActivity.java

package com.example.FileExplorer;

import android.app.ListActivity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.*;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class MyFileManagerActivity extends ListActivity {

private List<String> items = null; //�б�
private List<String> paths = null; //·��
private String rootPath = "/sdcard/"; //��·��
private String curPath = "/"; //��ǰ·��
private TextView mPath;
public int Selectedposition=-1;
private BaseAdapter FileAdapter;
@Override
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);

requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.fileselect);
mPath = (TextView) findViewById(R.id.mPath);
Button buttonConfirm = (Button) findViewById(R.id.buttonConfirm);
buttonConfirm.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

//将要传的值，在这里传过去
Intent data = new Intent(MyFileManagerActivity.this,MyActivity.class);
data.putExtra("filePath",curPath);

//注意：这里写的“20”接的时候判断那里也要写20
setResult(20,data);
// startActivity(data);
finish();

}
});
Button buttonCancle = (Button) findViewById(R.id.buttonCancle);
buttonCancle.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
finish();
}
});
getFileDir(rootPath);

}

private void getFileDir(String filePath) {
mPath.setText(filePath);
items = new ArrayList<String>();
paths = new ArrayList<String>();
File f = new File(filePath);
File[] files = f.listFiles();

if (!filePath.equals(rootPath)) {
items.add("b1");
paths.add(rootPath);
items.add("b2");
paths.add(f.getParent());
}
if (files==null){

}else{
for (int i = 0; i < files.length; i++) {
File file = files[i];
items.add(file.getName());
paths.add(file.getPath());
}

}
FileAdapter=new MyAdapter(this, items, paths,Selectedposition);
setListAdapter(FileAdapter);

}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// Selectedposition=position;
System.out.println("<<<<<<<<"+Selectedposition);
try {
File file = new File(paths.get(position));
if (file.isDirectory()) {
curPath = paths.get(position);
v.setBackgroundColor(Color.WHITE);
getFileDir(paths.get(position));
} else{
v.setSelected(true);
Selectedposition=position;
curPath = paths.get(position);
System.out.println("<<<<<<<<"+position);
}

}catch (Exception e){

e.printStackTrace();
}

}

}
小五奉上源码