一、实现效果

一个简单的demo。点击按钮，获取本地文件目录，可以选择图片，展示选取的对应图片和展示存储路径。如图所示：

二、实现方式

1. 权限

AndroidManifest.xml文件里面添加权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

2. 布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><ImageViewandroid:id="@+id/main_iv"android:layout_width="wrap_content"android:layout_height="wrap_content"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent" /><Buttonandroid:id="@+id/main_btn"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/file_store"android:textSize="20sp"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="@+id/main_iv"/><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/main_tx"tools:ignore="MissingConstraints" /></androidx.constraintlayout.widget.ConstraintLayout>

3. kotlin代码

class MainActivity : AppCompatActivity() {private lateinit var btn2: Buttonprivate lateinit var ivImage: ImageViewprivate lateinit var btx:TextViewprivate lateinit var activityResultLauncher: ActivityResultLauncher<Intent>@SuppressLint("MissingInflatedId")override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)btn2 = findViewById(R.id.main_btn)ivImage = findViewById(R.id.main_iv)btx=findViewById(R.id.main_tx)activityResultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->if (result.resultCode == RESULT_OK) {Log.e(this::class.java.name, "Result: " + result.data.toString())// 处理返回的图片数据val uri: Uri? = result.data?.datauri?.let {ivImage.setImageURI(it)Log.e(this::class.java.name, "Uri: $it")// 获取并显示图片的路径btx.text=getPathFromUri(it)}}}btn2.setOnClickListener {val intent = Intent(Intent.ACTION_PICK).apply {data = MediaStore.Images.Media.EXTERNAL_CONTENT_URItype = "image/*"}activityResultLauncher.launch(intent)}}//返回图片的路径字符串private fun getPathFromUri(uri:Uri):String{return uri.path?:"Unknown"}
}

以上就是全部内容

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