如何根据gridview中的屏幕尺寸设置图像宽度高度

Question

我想显示3x3大小的gridview.我想根据设备大小设置高度和宽度.我正在参考这个链接.

主要活动-

public class MainActivity extends Activity {

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

      GridView gridview = (GridView) findViewById(R.id.gridview);
      gridview.setAdapter(new ImageAdapter(this));
   }

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
      getMenuInflater().inflate(R.menu.main, menu);
      return true;
   }

}

activity_main-

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android" 
   android:id="@+id/gridview"
   android:layout_width="fill_parent" 
   android:layout_height="fill_parent"
   android:columnWidth="90dp"
   android:numColumns="auto_fit"
   android:verticalSpacing="10dp"
   android:horizontalSpacing="10dp"
   android:stretchMode="columnWidth"
   android:gravity="center"
/>

编辑-

就像首先获得屏幕高度和宽度一样,每个项目的高度和宽度是屏幕高度和宽度值的1/3.

Answer 1

不要使用屏幕大小,在多窗口上下文中此方法无效.如果您的网格是固定的3x3项目大小,那么使用自定义布局ViewGroup如下:(并设置RelativeLayout项目内容)

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle state) {
        setContentView(new ViewGroup(this) {
            private RelativeLayout[] items = new RelativeLayout[9];
            private int width, height, itemWidth, itemHeight;
            {
                Random r = new Random();
                for (int i = 0; i < 9; i++) {
                    items[i] = new RelativeLayout(getContext());
                    float[] hsv = new float[] {360 * r.nextFloat(), .50f, .75f};
                    items[i].setBackgroundColor(Color.HSVToColor(hsv));
                    addView(items[i]);

                    // UPDATE ////////////////////////////////////
                    ImageView image = new ImageView(getContext());
                    switch (i) {
                    case 0: // top left
                    case 1: // top center
                    case 2: // top right
                    case 3: // center left
                    case 4: // center center
                    case 5: // center right
                    case 6: // bottom left
                    case 7: // bottom center
                    case 8: // bottom right
                        image.setImageResource(R.drawable.ic_launcher);
                        break;
                    }
                    image.setScaleType(ScaleType.FIT_XY);
                    image.setLayoutParams(new RelativeLayout.LayoutParams(
                            RelativeLayout.LayoutParams.MATCH_PARENT,
                            RelativeLayout.LayoutParams.MATCH_PARENT
                    ));
                    items[i].addView(image);
                    //////////////////////////////////////////////
                }
            }
            @Override
            protected void onMeasure(int wMS, int hMS) {
                width = MeasureSpec.getSize(wMS);
                height = MeasureSpec.getSize(hMS);
                itemWidth = width / 3;
                itemHeight = height / 3;
                wMS = MeasureSpec.makeMeasureSpec(itemWidth, MeasureSpec.EXACTLY);
                hMS = MeasureSpec.makeMeasureSpec(itemHeight, MeasureSpec.EXACTLY);
                measureChildren(wMS, hMS);
                setMeasuredDimension(width, height);
            }
            @Override
            protected void onLayout(boolean changed, int l, int t, int r, int b) {
                for (int i = 0; i < 9; i++) {
                    l = itemWidth * (i % 3);
                    t = itemHeight * (i / 3);
                    r = l + itemWidth;
                    b = t + itemHeight;
                    items[i].layout(l, t, r, b);
                }
            }
        });
        super.onCreate(state);
    }

}

编辑:在代码中查看我的更新,您只需将图像添加到项目容器中即可.使用此方法,不需要XML布局文件,因为您自己管理内容和大小.

结果:

编辑:极简主义的方式:

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle state) {
        setContentView(new ViewGroup(this) {
            private static final int SIZE_X = 3;
            private static final int SIZE_Y = 3;
            private ImageView[] items = new ImageView[SIZE_X * SIZE_Y];
            private int itemWidth, itemHeight;
            {
                setBackgroundColor(Color.DKGRAY);
                for (int i = 0; i < items.length; i++) {
                    items[i] = new ImageView(getContext());
                    items[i].setScaleType(ScaleType.CENTER);
                    items[i].setImageResource(R.drawable.ic_launcher);
                    addView(items[i]);
                }
            }
            @Override
            protected void onMeasure(int wMS, int hMS) {
                int width = MeasureSpec.getSize(wMS);
                int height = MeasureSpec.getSize(hMS);
                itemWidth = width / SIZE_X;
                itemHeight = height / SIZE_Y;
                wMS = MeasureSpec.makeMeasureSpec(itemWidth, MeasureSpec.EXACTLY);
                hMS = MeasureSpec.makeMeasureSpec(itemHeight, MeasureSpec.EXACTLY);
                measureChildren(wMS, hMS);
                setMeasuredDimension(width, height);
            }
            @Override
            protected void onLayout(boolean changed, int l, int t, int r, int b) {
                for (int i = 0; i < items.length; i++) {
                    l = itemWidth * (i % SIZE_X);
                    t = itemHeight * (i / SIZE_X);
                    r = l + itemWidth;
                    b = t + itemHeight;
                    items[i].layout(l, t, r, b);
                }
            }
        });
        super.onCreate(state);
    }

}

结果:

@ Kanwaljit Singh:

在MainActivity项目创建循环中:

final int id = i;
items[i].setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
        startActivity(new Intent(getContext(), NextActivity.class).putExtra("id", id));
    }
});

在NextActivity中:

int id = getIntent().getIntExtra("id", -1);