android 从图库中选择图像

选择图像是在开发Android应用程序时常见的任务之一。Android提供了一个强大的图库框架，使我们能够从设备的图库中选择图像。本文将介绍如何使用Android的图库框架来选择图像，并提供一个简单的案例代码来演示该过程。

xml

java
Button chooseImageButton = findViewById(R.id.choose_image_button);
chooseImageButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(intent, PICK_IMAGE_REQUEST);
    }
});

java
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null) {
        Uri selectedImageUri = data.getData();
        // 在这里可以使用所选图像的URI进行后续操作
    }
}

java
public class MainActivity extends AppCompatActivity {
    private static final int PICK_IMAGE_REQUEST = 1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button chooseImageButton = findViewById(R.id.choose_image_button);
        chooseImageButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                startActivityForResult(intent, PICK_IMAGE_REQUEST);
            }
        });
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null) {
            Uri selectedImageUri = data.getData();
            // 在这里可以使用所选图像的URI进行后续操作
        }
    }
}