HarmonyOS鸿蒙Next应用开发练习：单向数据传送与双向数据传送

HarmonyOS鸿蒙Next应用开发练习：单向数据传送与双向数据传送 视图效果查看

点击按钮，可以把设置好的值传递到另外一个界面进行展示。

MainAbilitySlice.java 文件

package com.example.ability_ui_demo.slice;

import com.example.ability_ui_demo.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.colors.RgbColor;
import ohos.agp.components.*;
import ohos.agp.components.element.ShapeElement;
import ohos.hiviewdfx.HiLog;
import ohos.hiviewdfx.HiLogLabel;

public class MainAbilitySlice extends AbilitySlice {
    private static HiLogLabel c_hll = new HiLogLabel(HiLog.LOG_APP, 0x0908, "T.F.xie");

    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);

        setUIContent(ResourceTable.Layout_ability_main);
        Text text = (Text)findComponentById(ResourceTable.Id_test_text);
        Button button = (Button) findComponentById(ResourceTable.Id_test_button);

        ShapeElement element = new ShapeElement();
        element.setCornerRadius(18);
        element.setRgbColor(new RgbColor(43, 156, 15));

        button.setBackground(element);
        button.setClickedListener(new Component.ClickedListener() {
            private int a = 0;

            @Override
            public void onClick(Component component) {
                a++;
                text.setText("Clicked:" + a);

                Intent intent1 = new Intent();
                intent1.setParam("p1", 123);
                intent1.setParam("p2", 0.123f);
                intent1.setParam("p3", "小黑");

                presentForResult(new TargetSlice(), intent1, 0);
            }
        });
    }

    @Override
    protected void onResult(int requestCode, Intent intent){
        if (requestCode == 0){
            String s = intent.getStringParam("result");
            HiLog.info(c_hll, "MainAbilitySlice.onStar()");
        }
    }
}

TargetSlice.java

package com.example.ability_ui_demo.slice;

import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;
import ohos.agp.components.*;
import ohos.agp.components.element.ShapeElement;
import ohos.agp.utils.Color;
import ohos.agp.utils.TextAlignment;

public class TargetSlice extends AbilitySlice {
    // 定义一个容器对象，使用绝对定位来管理组件容器
    ComponentContainer container = new PositionLayout(this);

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

        container.setWidth(ComponentContainer.LayoutConfig.MATCH_PARENT);
        container.setHeight(ComponentContainer.LayoutConfig.MATCH_PARENT);

        ShapeElement element = new ShapeElement();

        String data = "";
        data += intent.getIntParam("p1", 0);
        data += " " + intent.getFloatParam("p2", 0);
        data += " " + intent.getStringParam("p3");

        Text text = new Text(this);
        text.setText(data);
        text.setTop(200);
        text.setLeft(100);
        text.setWidth(300);
        text.setHeight(40);
        text.setTextColor(Color.RED);
        text.setTextSize(36);
        text.setTextAlignment(TextAlignment.CENTER);

        container.addComponent(text);
        super.setUIContent(container);
    }

    @Override
    public void onActive() {
        super.onActive();

        Intent intent = new Intent();
        intent.setParam("result", "蛟龙腾飞");

        setResult(intent);
    }

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