鸿蒙app获取文本控件按钮控件_修改控件名称_按钮触发事件_

点击启动：提示信息显示

package com.example.myapplication.slice;

import com.example.myapplication.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.Button;
import ohos.agp.components.Component;
import ohos.agp.components.DirectionalLayout;

import ohos.agp.components.Text;
import ohos.agp.utils.LayoutAlignment;
import ohos.agp.window.dialog.ToastDialog;
import ohos.app.Context;
import ohos.hiviewdfx.HiLog;
import ohos.hiviewdfx.HiLogLabel;

public class MainAbilitySlice extends AbilitySlice {
    static final HiLogLabel loglabel2 = new HiLogLabel(HiLog.LOG_APP,0x001101,"MainAbility");
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);
        HiLog.info(loglabel2,"onStart-----------------------------------");
        int ppi = getContext().getResourceManager().getDeviceCapability().screenDensity;

        HiLog.info(loglabel2,"屏幕密度："+Integer.toString(ppi));

      //  Text text2 = new Text();
        DirectionalLayout.LayoutConfig configForText = new DirectionalLayout.LayoutConfig(
                toPixels(100,getContext()),
                toPixels(16,getContext())
        );
        //text2.setLayoutConfig(configForText);//如果报错，则导入import ohos.agp.components.Text;
       // text2.set
        Text text1 = (Text) findComponentById(ResourceTable.Id_text_1);
        Text text2 = (Text) findComponentById(ResourceTable.Id_text_2);
        Text text3 = (Text) findComponentById(ResourceTable.Id_text_3);
        Text text3a = (Text) findComponentById(ResourceTable.Id_text_3a);
        text1.setText("美好时光1");
        text2.setText("万事如意");
        text3.setText("好运常在");
        text3a.setText("鸿蒙app demo");

        Button button = (Button) findComponentById(ResourceTable.Id_btn1);
        button.setText("启动");
        button.setClickedListener(new Component.ClickedListener() {
            @Override
            public void onClick(Component component) {
                new ToastDialog(getContext())
                        .setText("This is a ToastDialog")
                        .setAlignment(LayoutAlignment.CENTER)
                        .show();
            }
        });


    }
    /**
     *虚拟像素转物理像素
     */
    private  static int toPixels(int value, Context context)
    {
        return value * context.getResourceManager().getDeviceCapability().screenDensity/160;
    }
    @Override
    public void onActive() {
        super.onActive();
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
    }
}

ability_main.xml布局文件

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"

    ohos:scrollbar_background_color="#FF4385E7"
    ohos:orientation="vertical">
    <Button
        ohos:id="$+id:btn1"
        ohos:text="$string:btn_name"
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:text_size ="40vp"
        ohos:background_element="$graphic:capsule_button_element"
        ohos:layout_alignment="horizontal_center"

        />
    <Text
        ohos:id="$+id:text_1"
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="$graphic:background_ability_main"
        ohos:layout_alignment="horizontal_center"
        ohos:text="$string:mainability_HelloWorld"
        ohos:text_size="40vp"
        />
    <Text
        ohos:id="$+id:text_2"
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="$graphic:background_ability_main"
        ohos:layout_alignment="horizontal_center"
        ohos:text="$string:mainability_HelloWorld2"
        ohos:text_size="40vp"
        />
    <Text
        ohos:id="$+id:text_3"
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="$graphic:background_ability_main"
        ohos:layout_alignment="horizontal_center"
        ohos:text="$string:mainability_HelloWorld3"
        ohos:text_size="40vp"
        />
    <Text
        ohos:id="$+id:text_3a"
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="$graphic:background_ability_main"
        ohos:text="$string:mainability_HelloWorld3a"
        ohos:text_size="40vp"
        ohos:layout_alignment="horizontal_center"
        />


</DirectionalLayout>