如何在安卓中通过意向打开特定文件夹?

原文:https://www . geeksforgeeks . org/如何通过安卓意图打开特定文件夹/

在本文中,我们将从我们的应用程序中打开一个特定的文件夹。这个特性在很多情况下都很有用。大多数时候,当我们想要上传任何文件时,应用程序只需打开文件管理器。但是我们可以实现这个功能来有效地使用,就像每当任何用户想要上传任何文件时,用户只需选择文件夹名称,如 WhatsApp、下载等。那么用户将只被引导到该文件夹。让我们看看这个特性的实现。

参考文章: 安卓意图

分步实施

第一步:创建新项目

要在安卓工作室创建新项目,请参考如何在安卓工作室创建/启动新项目。注意选择 Java 作为编程语言。

步骤 2:使用 activity_main.xml 文件

导航到应用程序> res >布局> activity_main.xml 并将下面的代码添加到该文件中。下面是 activity_main.xml 文件的代码。

可扩展标记语言

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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:gravity="center"
    android:orientation="vertical"
    android:padding="16dp"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/download"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Download Folder" />

    <Button
        android:id="@+id/movies"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Movies Folder" />

    <Button
        android:id="@+id/pic"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Pictures Folder" />

    <Button
        android:id="@+id/whtsapp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Whatsapp Content" />

    <Button
        android:id="@+id/music"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Music Folder" />

</LinearLayout>

第三步:使用MainActivity.java 文件

转到MainActivity.java文件,参考以下代码。以下是MainActivity.java文件的代码。代码中添加了注释,以更详细地理解代码。

Java 语言(一种计算机语言,尤用于创建网站)

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    Button movie, download, pic, music, whatsapp;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        movie = findViewById(R.id.movies);
        download = findViewById(R.id.download);
        whatsapp = findViewById(R.id.whtsapp);
        pic = findViewById(R.id.pic);
        music = findViewById(R.id.music);
        movie.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String path = Environment.getExternalStorageDirectory() + "/" + "Movies" + "/";
                Uri uri = Uri.parse(path);
                Intent intent = new Intent(Intent.ACTION_PICK);
                intent.setDataAndType(uri, "*/*");
                startActivity(intent);
            }
        });
        whatsapp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String path = Environment.getExternalStorageDirectory() + "/" + "WhatsApp" + "/";
                Uri uri = Uri.parse(path);
                Intent intent = new Intent(Intent.ACTION_PICK);
                intent.setDataAndType(uri, "*/*");
                startActivity(intent);
            }
        });
        download.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String path = Environment.getExternalStorageDirectory() + "/" + "Downloads" + "/";
                Uri uri = Uri.parse(path);
                Intent intent = new Intent(Intent.ACTION_PICK);
                intent.setDataAndType(uri, "*/*");
                startActivity(intent);
            }
        });
        music.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String path = Environment.getExternalStorageDirectory() + "/" + "Music" + "/";
                Uri uri = Uri.parse(path);
                Intent intent = new Intent(Intent.ACTION_PICK);
                intent.setDataAndType(uri, "*/*");
                startActivity(intent);
            }
        });
        pic.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String path = Environment.getExternalStorageDirectory() + "/" + "Pictures" + "/";
                Uri uri = Uri.parse(path);
                Intent intent = new Intent(Intent.ACTION_PICK);
                intent.setDataAndType(uri, "*/*");
                startActivity(intent);
            }
        });
    }
}

输出:

[https://media.geeksforgeeks.org/wp-content/uploads/20210517135455/content.mp4](https://media.geeksforgeeks.org/wp-content/uploads/20210517135455/content.mp4)