Android 用源代码写layout布局

通过纯代码实现XML同样的效果：

[java] view plain copy

import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.text.InputFilter;
import android.text.InputFilter.LengthFilter;
import android.view.Gravity;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.ScrollView;
import android.widget.TextView;
public class ActivityInfo extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
// setContentView(R.layout.info);
initUI();
}
public final void initUI(){
ScrollView main = new ScrollView(this);
main.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
main.setBackgroundColor(Color.WHITE);
//根布局参数
LinearLayout.LayoutParams layoutParamsRoot = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.FILL_PARENT);
layoutParamsRoot.gravity = Gravity.CENTER;
//根布局
LinearLayout layoutRoot = new LinearLayout(this);
layoutRoot.setLayoutParams(layoutParamsRoot);
layoutRoot.setOrientation(LinearLayout.VERTICAL);
//上边距（dp值）
int topMargin = dip2px(this, 30);
//imageMain宽度（dp值）
int widthMain = dip2px(this, 240);
//imageMain高度（dp值）
int heightMain = dip2px(this, 120);
//imageMain布局参数
LinearLayout.LayoutParams layoutParamsImageMain = new LinearLayout.LayoutParams(widthMain,heightMain);
layoutParamsImageMain.topMargin = topMargin;
layoutParamsImageMain.bottomMargin = topMargin;
layoutParamsImageMain.leftMargin = topMargin;
layoutParamsImageMain.rightMargin = topMargin;
layoutParamsImageMain.gravity=Gravity.CENTER_HORIZONTAL;
//初始化ImageView
ImageView imageMain = new ImageView(this);
imageMain.setScaleType(ScaleType.FIT_CENTER);
imageMain.setAdjustViewBounds(true);
imageMain.setBackgroundColor(Color.BLACK);
imageMain.setImageResource(android.R.drawable.ic_dialog_map);
layoutRoot.addView(imageMain, layoutParamsImageMain);
//textInfo布局参数
LinearLayout.LayoutParams layoutParamsTextInfo = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT);
layoutParamsTextInfo.topMargin = topMargin;
layoutParamsTextInfo.bottomMargin = topMargin;
layoutParamsTextInfo.leftMargin = topMargin;
layoutParamsTextInfo.rightMargin = topMargin;
layoutParamsTextInfo.gravity=Gravity.CENTER_HORIZONTAL;
//初始化textInfo
TextView textInfo = new TextView(this);
textInfo.setGravity(Gravity.CENTER_HORIZONTAL);
textInfo.setTextSize(18);
layoutRoot.addView(textInfo, layoutParamsTextInfo);
//editInfo布局参数
LinearLayout.LayoutParams layoutParamsEditInfo = new LinearLayout.LayoutParams(widthMain,LayoutParams.WRAP_CONTENT);
layoutParamsEditInfo.topMargin = topMargin;
layoutParamsEditInfo.gravity=Gravity.CENTER_HORIZONTAL;
//初始化editInfo
EditText editInfo = new EditText(this);
editInfo.setHint("请输入文字内容");
//设置可输入的最大长度
InputFilter[] filters = {new LengthFilter(200)};
editInfo.setFilters(filters);
editInfo.setTextSize(18);
layoutRoot.addView(editInfo, layoutParamsEditInfo);
//上边距（dp值）
int minHeight = dip2px(this, 54);
//上padding（dp值）
int topPadding = dip2px(this, 4);
//左padding（dp值）
int leftPadding = dip2px(this, 2);
//按钮布局
LinearLayout layoutButton = new LinearLayout(this);
layoutButton.setLayoutParams(layoutParamsEditInfo);
layoutButton.setOrientation(LinearLayout.HORIZONTAL);
layoutButton.setBackgroundColor(Color.parseColor("#c6c3c6"));
layoutButton.setMinimumHeight(minHeight);
layoutButton.setPadding(leftPadding, topPadding, leftPadding, topPadding);
layoutButton.setId(100000001);
//buttonOK布局参数
LinearLayout.LayoutParams layoutParamsButtonOK = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
layoutParamsButtonOK.gravity = Gravity.LEFT;
layoutParamsButtonOK.leftMargin = dip2px(this, 10);
layoutParamsButtonOK.rightMargin = dip2px(this, 5);
layoutParamsButtonOK.weight = 1;
//Button确定
Button buttonOK = new Button(this);
buttonOK.setLayoutParams(layoutParamsButtonOK);
buttonOK.setMaxLines(2);
buttonOK.setTextSize(18);
buttonOK.setText("确定");
layoutButton.addView(buttonOK);
//buttonCancel布局参数
LinearLayout.LayoutParams layoutParamsButtonCancel = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
layoutParamsButtonCancel.gravity = Gravity.RIGHT;
layoutParamsButtonCancel.leftMargin = dip2px(this, 5);
layoutParamsButtonCancel.rightMargin = dip2px(this, 10);
layoutParamsButtonCancel.weight = 1;
//Button取消
Button buttonCancel = new Button(this);
buttonCancel.setLayoutParams(layoutParamsButtonCancel);
buttonCancel.setMaxLines(2);
buttonCancel.setTextSize(18);
buttonCancel.setText("取消");
layoutButton.addView(buttonCancel);
layoutRoot.addView(layoutButton, layoutParamsEditInfo);
//RelativeLayout布局参数
LinearLayout.LayoutParams layoutParamsBottom = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT);
RelativeLayout layoutBottom = new RelativeLayout(this);
layoutBottom.setLayoutParams(layoutParamsBottom);
RelativeLayout.LayoutParams paramsImageBottom = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
paramsImageBottom.addRule(RelativeLayout.BELOW, 100000001);
paramsImageBottom.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE);
paramsImageBottom.setMargins(topMargin, topMargin, topMargin, topMargin);
//初始化ImageView
ImageView imageBottom = new ImageView(this);
imageBottom.setScaleType(ScaleType.FIT_CENTER);
imageBottom.setAdjustViewBounds(true);
imageBottom.setBackgroundColor(0xFF777777);
imageBottom.setImageResource(android.R.drawable.ic_dialog_email);
layoutBottom.addView(imageBottom, paramsImageBottom);
layoutRoot.addView(layoutBottom);
//TODO TEST
// imageMain.setBackgroundResource(android.R.drawable.ic_dialog_map);
textInfo.setText("测试文本显示");
main.addView(layoutRoot);
setContentView(main);
}
/**
* 根据手机的分辨率从 dp 的单位转成为 px(像素)
*/
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
/**
* 根据手机的分辨率从 px(像素) 的单位转成为 dp
*/
public static int px2dip(Context context, float pxValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (pxValue / scale + 0.5f);
}
}

效果图：

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