Question

我正试图改变直线布局或任何其他植被,以动态方式,但放弃例外。

我的任务是:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/abc"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView   
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="ghghjkgj ghjg hjgj ghj g hjgjgh jhg "
    />
</LinearLayout>

以及我的活动是:

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        LinearLayout ll = (LinearLayout)findViewById(R.id.abc);
        ll.setLayoutParams(new LinearLayout.LayoutParams(30,60));
    }

以下例外:

E/AndroidRuntime(16052): java.lang.ClassCastException: android.widget.LinearLayout$LayoutParams
E/AndroidRuntime(16052):    at android.widget.FrameLayout.onLayout(FrameLayout.java:288)
E/AndroidRuntime(16052):    at android.view.View.layout(View.java:7035)
E/AndroidRuntime(16052):    at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1249)
E/AndroidRuntime(16052):    at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1125)
E/AndroidRuntime(16052):    at android.widget.LinearLayout.onLayout(LinearLayout.java:1042)
E/AndroidRuntime(16052):    at android.view.View.layout(View.java:7035)
E/AndroidRuntime(16052):    at android.widget.FrameLayout.onLayout(FrameLayout.java:333)
E/AndroidRuntime(16052):    at android.view.View.layout(View.java:7035)
E/AndroidRuntime(16052):    at android.view.ViewRoot.performTraversals(ViewRoot.java:1045)
E/AndroidRuntime(16052):    at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
E/AndroidRuntime(16052):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(16052):    at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(16052):    at android.app.ActivityThread.main(ActivityThread.java:4627)
E/AndroidRuntime(16052):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(16052):    at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime(16052):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime(16052):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
E/AndroidRuntime(16052):    at dalvik.system.NativeStart.main(Native Method)

因此,我如何能够动态改变层面?

Answer 1

查阅:

ll.getLayoutParams().height = 300;
ll.getLayoutParams().width = 200;
ll.requestLayout();

这项工作还涉及事件手。

Answer 2

这里的问题是,当你确定布局时,家长的类型必须是哪一类,在这种情况下,就是一小块。你们需要这样做:

ll.setLayoutParams(new FrameLayout.LayoutParams(30,60));

Answer 3

2. 完成以下任务的简单方式:

setContentView(R.id.main);    
LinearLayout layout= (LinearLayout) findViewById(R.id.left);
int width=60;
int height=60;
LinearLayout.LayoutParams parms = new LinearLayout.LayoutParams(width,height);
layout.setLayoutParams(parms);

如果你想在身高和宽度上进行筛选,然后使用以下代码:

setContentView(R.id.main);    
Display display = getWindowManager().getDefaultDisplay();
LinearLayout layout= (LinearLayout) findViewById(R.id.left);
int width=display.getWidth();
int height=display.getHeight();
LinearLayout.LayoutParams parms = new inearLayout.LayoutParams(width,height);
layout.setLayoutParams(parms);

希望能充分利用你们。

Answer 4

www.un.org/Depts/DGACM/index_spanish.htm 您可在您的功用类别中采用这一方法,以动态方式确定身高和宽度。

 public void setWidthAndHeight(Context context,RelativeLayout view,int width, int height) {
                width = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, width, context.getResources().getDisplayMetrics());//used to convert you width integer value same as dp
                height = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, height, context.getResources().getDisplayMetrics());
               //note : if your layout is LinearLayout then use LinearLayout.LayoutParam
                view.setLayoutParams(new RelativeLayout.LayoutParams(width, height));
         }

友情链接