[英]Change GRAVITY and SIZE of View programmatically
我想以编程方式保持重力来改变我的View(CanvasView extends View)的大小。 我的视图在RelativeLayout中。 我尝试了很多不同的方法,但我被卡住了......
关键是,我想根据屏幕大小设置大小:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ToolsAndConstants.metrics = new DisplayMetrics();
windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
windowManager.getDefaultDisplay().getMetrics(ToolsAndConstants.metrics);
setContentView(R.layout.activity_dictionary);
CanvasView canvasView = (CanvasView) findViewById(R.id.activity_dictionary_CanvasView);
canvasView.canvasWidth = (ToolsAndConstants.metrics.widthPixels / 10 * 7) - 10;
canvasView.canvasHeight = (ToolsAndConstants.metrics.heightPixels / 10 * 4) - 10;
canvasView.setLayoutParams(new RelativeLayout.LayoutParams(canvasView.canvasWidth, canvasView.canvasHeight));
(...)
}
XML文件:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_dictionary_relativeLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/gray_patterns_vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".LogReader" >
<LinearLayout
android:id="@+id/activity_dictionary_linearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerHorizontal="true"
android:gravity="center_vertical|center_horizontal"
android:orientation="vertical" >
<ProgressBar
android:id="@+id/activity_dictionary_progressBar1"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal" />
<TextView
android:id="@+id/activity_dictionary_textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Loading dictionary..."
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="@android:color/white" />
</LinearLayout>
<FrameLayout
android:id="@+id/activity_dictionary_frameLayout1"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" >
<view
android:id="@+id/activity_dictionary_CanvasView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="0dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
class="com.example.dictionary.CanvasView"
android:orientation="vertical" />
</FrameLayout>
</RelativeLayout>
我怎样才能调整它?
我找到了解决方案:
canvasView = (CanvasView) findViewById(R.id.activity_dictionary_CanvasView);
canvasView.canvasWidth = 100;
canvasView.canvasHeight = 100;
RelativeLayout.LayoutParams layoutParams =
new RelativeLayout.LayoutParams(canvasView.canvasWidth, canvasView.canvasHeight);
//I want my Canvas be above LinearLayout and Horizontaly centered
layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
layoutParams.addRule(RelativeLayout.ABOVE, R.id.activity_dictionary_linearLayout2);
canvasView.setLayoutParams(layoutParams);
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