我试图实现以下编程方式(而不是通过XML声明):
<RelativeLayout...>
<TextView ...
android:id="@+id/label1" />
<TextView ...
android:id="@+id/label2"
android:layout_below: "@id/label1" />
</RelativeLayout>
换句话说,我如何使第二个TextView出现在第一个下面,但我想在代码中这样做:
RelativeLayout layout = new RelativeLayout(this);
TextView label1 = new TextView(this);
TextView label2 = new TextView(this);
...
layout.addView(label1);
layout.addView(label2);
setContentView(layout);
更新:
谢谢,TreeUK。我理解大致的方向,但还是不行——B和A重叠。我做错了什么?
RelativeLayout layout = new RelativeLayout(this);
TextView tv1 = new TextView(this);
tv1.setText("A");
TextView tv2 = new TextView(this);
tv2.setText("B");
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.FILL_PARENT);
lp.addRule(RelativeLayout.RIGHT_OF, tv1.getId());
layout.addView(tv1);
layout.addView(tv2, lp);
根据我所能够拼凑的内容,您必须使用LayoutParams添加视图。
LinearLayout linearLayout = new LinearLayout(this);
RelativeLayout.LayoutParams relativeParams = new RelativeLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
relativeParams.addRule(RelativeLayout.ALIGN_PARENT_TOP);
parentView.addView(linearLayout, relativeParams);
所有功劳都归功于sechastain,以编程方式相对定位您的项目,您必须为它们分配id。
TextView tv1 = new TextView(this);
tv1.setId(1);
TextView tv2 = new TextView(this);
tv2.setId(2);
然后addRule(使用。RIGHT_OF tv1.getId ());
ViewGroup的这种方法。MarginLayoutParams为我工作:
RelativeLayout myLayout = (RelativeLayout) findViewById(R.id.my_layout);
TextView someTextView = ...
int leftMargin = Util.getXPos();
int topMargin = Util.getYPos();
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
new ViewGroup.MarginLayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT));
lp.setMargins(leftMargin, topMargin, 0, 0);
myLayout.addView(someTextView, lp);
Android 22最小可运行的例子
来源:
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class Main extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final RelativeLayout relativeLayout = new RelativeLayout(this);
final TextView tv1;
tv1 = new TextView(this);
tv1.setText("tv1");
// Setting an ID is mandatory.
tv1.setId(View.generateViewId());
relativeLayout.addView(tv1);
// tv2.
final TextView tv2;
tv2 = new TextView(this);
tv2.setText("tv2");
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.FILL_PARENT);
lp.addRule(RelativeLayout.BELOW, tv1.getId());
relativeLayout.addView(tv2, lp);
// tv3.
final TextView tv3;
tv3 = new TextView(this);
tv3.setText("tv3");
RelativeLayout.LayoutParams lp2 = new RelativeLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT
);
lp2.addRule(RelativeLayout.BELOW, tv2.getId());
relativeLayout.addView(tv3, lp2);
this.setContentView(relativeLayout);
}
}
使用android生成的默认项目创建项目....GitHub存储库与最小的构建代码。
Try:
EditText edt = (EditText) findViewById(R.id.YourEditText);
RelativeLayout.LayoutParams lp =
new RelativeLayout.LayoutParams
(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT
);
lp.setMargins(25, 0, 0, 0); // move 25 px to right (increase left margin)
edt.setLayoutParams(lp); // lp.setMargins(left, top, right, bottom);