Question

我想从图库中加载图像并在视图中居中，但不执行缩放。单击左，右，上和下按钮时，图像应在查看窗口中移动，步长约为5像素。

以下是我到目前为止所做的

Java代码

public class MainActivity extends AppCompatActivity {

final int PICK_IMAGE_REQUEST = 111;
boolean imageLoaded = false;
ImageView imgView;
boolean state = false;
Button up,down,left,right;

Bitmap inputBM, outputBM;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    up = (Button) findViewById(R.id.up);
    left=(Button)findViewById(R.id.left);
    right=(Button)findViewById(R.id.right);
    down=(Button)findViewById(R.id.down);

    final double contrastValue = 100;



    up.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(getApplication(), "UP", Toast.LENGTH_SHORT).show();
            RelativeLayout.LayoutParams mParams = (RelativeLayout.LayoutParams)imgView.getLayoutParams();
            mParams.topMargin -= 5;
            imgView.setLayoutParams(mParams);
        }
    });

    down.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(getApplication(),"DOWN",Toast.LENGTH_SHORT).show();


            RelativeLayout.LayoutParams mParams = (RelativeLayout.LayoutParams)
                    imgView.getLayoutParams();
            mParams.topMargin += 20;
            imgView.setLayoutParams(mParams);

        }
    });

    left.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(getApplication(),"LEFT",Toast.LENGTH_SHORT).show();
            RelativeLayout.LayoutParams mParams = (RelativeLayout.LayoutParams)
                    imgView.getLayoutParams();
            mParams.leftMargin -= 20;
            imgView.setLayoutParams(mParams);
        }
    });

    right.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(getApplication(),"RIGHT",Toast.LENGTH_SHORT).show();

            RelativeLayout.LayoutParams mParams = (RelativeLayout.LayoutParams)
                    imgView.getLayoutParams();
            mParams.leftMargin += 20;
            imgView.setLayoutParams(mParams);
        }
    });

}


public void loadImage(View view) {
    Intent i = new Intent();
    // Show only images, no videos or anything else
    i.setType("image/*");
    i.setAction(Intent.ACTION_GET_CONTENT);
    // Always show the chooser (if there are multiple options available)
    startActivityForResult(Intent.createChooser(i, "Select Picture"), 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 && data.getData() != null) {

        Uri uri = data.getData();

        try {
            inputBM = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);

            imgView = (ImageView) findViewById(R.id.image);
            imgView.setImageBitmap(inputBM);
            imgView.setScaleType(ImageView.ScaleType.CENTER);
            imageLoaded = true;
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

XML代码

<RelativeLayout
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"
android:layout_margin="10dp"
tools:context=".MainActivity">

<ImageView
    android:id="@+id/image"
    android:layout_width="360dp"
    android:layout_height="320dp"
    android:onClick="loadImage"
    android:scaleType="centerCrop"
    android:src="@drawable/no_image" />



<Button
    android:id="@+id/up"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="100dp"
    android:text="Button" />

<Button
    android:id="@+id/down"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="14dp"
    android:text="Button" />

<Button
    android:id="@+id/left"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"

    android:layout_alignTop="@+id/right"
    android:layout_toStartOf="@+id/up"
    android:text="Button" />

<Button
    android:id="@+id/right"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"

    android:layout_below="@+id/up"
    android:layout_marginTop="-100dp"
    android:layout_toEndOf="@+id/up"
    android:text="Button" />

但这不能按预期工作。它移动图像视图而不是图像视图内的图像。请对此提供帮助或提供其他解决方案来实现此目的。预先感谢。

Answer 1

将这些更改放入XML

<RelativeLayout
    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"
    android:layout_margin="10dp"
    tools:context=".MainActivity">


    <RelativeLayout
        android:layout_width="360dp"
        android:layout_height="320dp"
        android:gravity="center">

        <ImageView
            android:id="@+id/image"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@mipmap/ic_launcher"
            android:onClick="loadImage"
            android:scaleType="centerCrop" />

    </RelativeLayout>

    <Button
        android:id="@+id/up"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="100dp"
        android:text="Button" />

    <Button
        android:id="@+id/down"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="14dp"
        android:text="Button" />

    <Button
        android:id="@+id/left"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/right"
        android:layout_toStartOf="@+id/up"
        android:text="Button" />

    <Button
        android:id="@+id/right"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/up"
        android:layout_marginTop="-100dp"
        android:layout_toEndOf="@+id/up"
        android:text="Button" />

</RelativeLayout>

它仍然会使您的“图像视图”移动，但是您的视图将是图像的大小，因此会给人以图像正在移动的感觉。

在图像视图中移动图像

1 个答案: