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android - 屏幕尺寸无效？

问题描述

我知道并应用表格来获取屏幕的尺寸，但是有些失败，因为显然它在所有分辨率下都无效。例如，如果我为小分辨率定义了一些按钮的位置，那么当我以更高分辨率运行应用程序时，这些按钮会向下滑动。在下图中，我给出了按钮如何出现在 Emulator 2.7 QVGA API 25（小）和 Nexus 7 API 25（xlarge）中的示例。我是否可以得出结论说 Android Studio 失败了？请帮我看看我的问题，因为我之前已经搜索并列出了它，但我没有收到任何正确的答案。这是我的xml： 

<android.support.constraint.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">

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/scrollView"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="15"
    android:orientation="vertical">

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:components="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:id="@+id/layout1">

    </RelativeLayout>
</ScrollView>

这是我的java：

public class MainActivity extends AppCompatActivity {

View pulsado;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.activity_main);

    //Width and height of screen
    DisplayMetrics metrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(metrics);
    int width = metrics.widthPixels;
    int height = metrics.heightPixels;

    // Buttons are placed
    RelativeLayout layout = (RelativeLayout) findViewById(R.id.layout1);
    for (int i = 1; i < 5; i++) {
        RelativeLayout.LayoutParams rel_btn = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
        // Size of Buttons
        rel_btn.width = 4 * width / 100;
        rel_btn.height = 4 * width / 100;
        // Position of Buttons
        switch (i) {
            case 1:  // top left
                rel_btn.leftMargin = 0;
                rel_btn.topMargin = 0;
                break;
            case 2: // top right
                rel_btn.leftMargin = 96 * width / 100;
                rel_btn.topMargin = 0;
                break;
            case 3:  // lower left
                rel_btn.leftMargin = 0;
                rel_btn.topMargin = 80 * height / 100;
                break;
            case 4:  // lower right
                rel_btn.leftMargin = 96 * width / 100;
                rel_btn.topMargin = 80 * height / 100;
                break;
        }
        Button btnTag = new Button(this);
        btnTag.setLayoutParams(rel_btn);
        btnTag.setBackgroundColor(Color.BLUE);
        btnTag.setId(0 + i);
        btnTag.setOnClickListener(prueba);
        layout.addView(btnTag);
    }
}

    private View.OnClickListener prueba = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (pulsado != null) {
                Button button1 = (Button) pulsado;
                button1.setBackgroundColor(Color.BLUE);
            }
            Button button2 = (Button) view;
            GradientDrawable drawable = new GradientDrawable();
            drawable.setShape(GradientDrawable.RECTANGLE);
            drawable.setStroke(8, Color.RED);
            button2.setBackgroundDrawable(drawable);
            pulsado = view;
        }
    };
}

在此处输入图像描述

标签： androidandroid-studio

解决方案

您可以尝试在布局文件本身中设置按钮。

<android.support.constraint.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">

    <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/scrollView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fillViewport="true"
        android:layout_weight="15"
        android:orientation="vertical">

        <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:components="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:orientation="vertical"
            android:id="@+id/layout1">

            <Button
                android:id="@+id/one"
                android:layout_width="wrap_content"
                android:layout_height="40dp" 
                android:background="@color/colorPrimary"
                />

            <Button
                android:layout_width="wrap_content"
                android:layout_height="40dp"
                android:layout_alignParentRight="true"
                android:background="@color/colorPrimary"
                />

            <Button
                android:layout_width="wrap_content"
                android:layout_height="40dp"
                android:layout_alignParentBottom="true"
                android:background="@color/colorPrimary"
                />

            <Button
                android:layout_width="wrap_content"
                android:layout_height="40dp"
                android:layout_alignParentBottom="true"
                android:layout_alignParentRight="true"
                android:background="@color/colorPrimary"/>
        </RelativeLayout>
    </ScrollView>
</android.support.constraint.ConstraintLayout>

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