Page Ability生命周期

2020-10-13 本文已影响0人裴云飞

Page 生命周期回调

Page生命周期，原谅我无耻的从官网盗了一张图

onStart()
当系统首次创建Page实例时，触发该回调。对于一个Page实例，该回调在其生命周期过程中仅触发一次，Page在该逻辑后将进入非活跃状态。
onActive()
Page 会在进入非活跃状态后来到前台，然后系统调用此回调。Page 在此之后进入活跃状态，该状态是应用与用户交互的状态。当另一个页面来到前台，会触发 Page 回到非活跃状态，系统将调用 onInactive() 回调。此后，Page 可能重新回到活跃状态，系统将再次调用 onActive() 回调。
onInactive()
当Page失去焦点时，系统将调用此回调，此后Page进入非活跃状态。
onBackground()
如果Page不再对用户可见，系统将调用此回调通知开发者用户进行相应的资源释放，此后Page进入后台状态。
onForeground()
处于后台状态的Page仍然驻留在内存中，当重新回到前台时（比如用户重新导航到此Page），系统将先调用onForeground()回调通知开发者，而后Page的生命周期状态回到非活跃状态，最后Page的生命周期状态进一步回到活跃状态，系统将通过onActive()回调通知开发者用户。
onStop()
系统将要销毁 Page 时，将会触发此回调函数，通知用户进行系统资源的释放。销毁 Page 的可能原因包括以下几个方面：
- 用户通过系统管理能力关闭指定 Page，例如使用任务管理器关闭 Page。
- 用户行为触发 Page 的 terminateAbility() 方法调用，例如使用应用的退出功能。
- 配置变更导致系统暂时销毁 Page 并重建。
- 系统出于资源管理目的，自动触发对处于后台状态 Page 的销毁。

AbilitySlice生命周期

AbilitySlice作为Page的组成单元，其生命周期是依托于其所属Page生命周期的。AbilitySlice和Page具有相同的生命周期状态和同名的回调，当Page生命周期发生变化时，它的AbilitySlice也会发生相同的生命周期变化。此外，AbilitySlice还具有独立于Page的生命周期变化，这发生在同一Page中的AbilitySlice之间导航时，此时Page的生命周期状态不会改变。

页面跳转的生命周期回调

为了便于理解，我们写个案例，MainAbility有两个slice，分别是MainAbilitySlice和MainOtherAbilitySlice。另外还有个SecondAbility，SecondAbility的slice叫做SecondAbilitySlice。

public class MainAbility extends Ability {

    private HiLogLabel mHiLogLabel = new HiLogLabel(HiLog.DEBUG, 0x00101, "MainAbility");

    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setMainRoute(MainAbilitySlice.class.getName());
        HiLog.info(mHiLogLabel, "onStart");
    }

    @Override
    protected void onActive() {
        super.onActive();
        HiLog.info(mHiLogLabel, "onActive");
    }

    @Override
    protected void onInactive() {
        super.onInactive();
        HiLog.info(mHiLogLabel, "onStart");
    }

    @Override
    protected void onBackground() {
        super.onBackground();
        HiLog.info(mHiLogLabel, "onBackground");
    }

    @Override
    protected void onForeground(Intent intent) {
        super.onForeground(intent);
        HiLog.info(mHiLogLabel, "onForeground");
    }

    @Override
    protected void onStop() {
        super.onStop();
        HiLog.info(mHiLogLabel, "onStop");
    }
}

MainAbility里面的MainAbilitySlice

public class MainAbilitySlice extends AbilitySlice {

    private HiLogLabel mHiLogLabel = new HiLogLabel(HiLog.DEBUG, 0x00101, "MainAbilitySlice");
    public static final int PRESENT_REQUEST_CODE = 0x01;
    public static final int INTENT_REQUEST_CODE = 0x02;
    private Text mText;
    private Text same;
    private Text next;

    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_main_ability);
        HiLog.info(mHiLogLabel, "onStart");
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder()
                .url("https://api.github.com/repos/JetBrains/Kotlin")
                .build();
        client.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {
                System.out.println("MainAbilitySlice" + e.getMessage());
            }

            @Override
            public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
                System.out.println("MainAbilitySlice" + response.body().string());
            }
        });
    }

    @Override
    public void onActive() {
        super.onActive();
        HiLog.info(mHiLogLabel, "onActive");
        same = (Text) findComponentById(ResourceTable.Id_same);
        next = (Text) findComponentById(ResourceTable.Id_next);
        mText = (Text) findComponentById(ResourceTable.Id_text);
        same.setClickedListener(new Component.ClickedListener() {
            @Override
            public void onClick(Component component) {
                Intent intent = new Intent();
                intent.setParam("user", "您好");
                presentForResult(new MainOtherAbilitySlice(), intent, PRESENT_REQUEST_CODE);
            }
        });
        next.setClickedListener(new Component.ClickedListener() {
            @Override
            public void onClick(Component component) {
                Intent intent = new Intent();
                Operation operation = new Intent.OperationBuilder()
                        .withDeviceId("")
                        .withBundleName("com.example.abilityslicenavigation")
                        .withAbilityName("com.example.abilityslicenavigation.SecondAbility")
                        .build();
                intent.setParam("user", "您好");
                intent.setOperation(operation);
                startAbilityForResult(intent, INTENT_REQUEST_CODE);
            }
        });
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
        HiLog.info(mHiLogLabel, "onForeground");
    }

    @Override
    protected void onBackground() {
        super.onBackground();
        HiLog.info(mHiLogLabel, "onBackground");
    }

    @Override
    protected void onInactive() {
        super.onInactive();
        HiLog.info(mHiLogLabel, "onInactive");
    }

    @Override
    protected void onStop() {
        super.onStop();
        HiLog.info(mHiLogLabel, "onStop");
    }
}

MainAbility里面的MainOtherAbilitySlice

public class MainOtherAbilitySlice extends AbilitySlice {

    private HiLogLabel mHiLogLabel = new HiLogLabel(HiLog.LOG_APP, 0x00101, "MainOtherAbilitySlice");
    private DirectionalLayout myLayout = new DirectionalLayout(this);

    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        HiLog.info(mHiLogLabel, "onStart");
        LayoutConfig config = new LayoutConfig(LayoutConfig.MATCH_PARENT, LayoutConfig.MATCH_PARENT);
        myLayout.setLayoutConfig(config);
        ShapeElement element = new ShapeElement();
        element.setRgbColor(new RgbColor(255, 255, 255));
        myLayout.setBackground(element);
        Text text = new Text(this);
        text.setLayoutConfig(config);
        text.setText("同一个页面的另一个AbilitySlice");
        text.setTextColor(new Color(0xFF000000));
        text.setTextSize(50);
        text.setTextAlignment(TextAlignment.CENTER);
        myLayout.addComponent(text);
        super.setUIContent(myLayout);
    }

    @Override
    public void onActive() {
        super.onActive();
        HiLog.info(mHiLogLabel, "onActive");
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
        HiLog.info(mHiLogLabel, "onForeground");
    }

    @Override
    protected void onInactive() {
        super.onInactive();
        HiLog.info(mHiLogLabel, "onInactive");
    }

    @Override
    protected void onBackground() {
        super.onBackground();
        HiLog.info(mHiLogLabel, "onBackground");
    }

    @Override
    protected void onStop() {
        super.onStop();
        HiLog.info(mHiLogLabel, "onStop");
    }
}

public class SecondAbility extends Ability {

    private HiLogLabel mHiLogLabel = new HiLogLabel(HiLog.DEBUG, 0x00101, "SecondAbility");

    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setMainRoute(SecondAbilitySlice.class.getName());
        HiLog.info(mHiLogLabel, "onStart");
    }

    @Override
    protected void onActive() {
        super.onActive();
        HiLog.info(mHiLogLabel, "onActive");
    }

    @Override
    protected void onInactive() {
        super.onInactive();
        HiLog.info(mHiLogLabel, "onStart");
    }

    @Override
    protected void onBackground() {
        super.onBackground();
        HiLog.info(mHiLogLabel, "onBackground");
    }

    @Override
    protected void onForeground(Intent intent) {
        super.onForeground(intent);
        HiLog.info(mHiLogLabel, "onForeground");
    }

    @Override
    protected void onStop() {
        super.onStop();
        HiLog.info(mHiLogLabel, "onStop");
    }
}

SecondAbility里面的SecondAbilitySlice

public class SecondAbilitySlice extends AbilitySlice {

    private HiLogLabel mHiLogLabel = new HiLogLabel(HiLog.LOG_APP, 0x00101, "SecondAbilitySlice");

    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        HiLog.info(mHiLogLabel, "onStart");
        super.setUIContent(ResourceTable.Layout_second_ability);
    }

    @Override
    public void onActive() {
        super.onActive();
        HiLog.info(mHiLogLabel, "onActive");
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
        HiLog.info(mHiLogLabel, "onForeground");
    }

    @Override
    protected void onBackground() {
        super.onBackground();
        HiLog.info(mHiLogLabel, "onBackground");
    }

    @Override
    protected void onInactive() {
        super.onInactive();
        HiLog.info(mHiLogLabel, "onInactive");
    }

    @Override
    protected void onStop() {
        super.onStop();
        HiLog.info(mHiLogLabel, "onStop");
    }
}

1、运行项目，首先启动MainAbility的MainAbilitySlice，生命周期的调用顺序为：
MainAbility.onStart() --> MainAbilitySlice.onStart() --> MainAbility.onActive() --> MainAbilitySlice.onActive()

2、跳转到MainAbility的MainOtherAbilitySlice，生命周期的调用顺序为：
MainAbilitySlice.onInactive() --> MainOtherAbilitySlice.onStart() --> MainOtherAbilitySlice.onActive() --> MainAbilitySlice.onBackground()

3、关闭MainAbility的MainOtherAbilitySlice，生命周期的调用顺序为：
MainOtherAbilitySlice.onInactive() --> MainAbilitySlice.onForeground() --> MainAbilitySlice.onActive() --> MainOtherAbilitySlice.onBackground() --> MainOtherAbilitySlice.onStop()

同一Page中的AbilitySlice之间导航，Page的生命周期状态不会改变。在这个流程中，MainAbility始终处于活跃状态。

4、在MainAbility中启动SecondAbility的SecondAbilitySlice，生命周期的调用顺序为：
MainAbility.onStart() --> MainAbilitySlice.onInactive() --> SecondAbility.onStart() --> SecondAbilitySlice.onStart() --> SecondAbility.onActive() --> SecondAbilitySlice.onActive() --> MainAbility.onBackground() --> MainAbilitySlice.onBackground()

5、关闭SecondAbility的SecondAbilitySlice，生命周期的调用顺序为：
SecondAbility.onStart() --> SecondAbilitySlice.onInactive() --> MainAbility.onForeground() --> MainAbilitySlice.onForeground() --> MainAbility.onActive() --> MainAbilitySlice.onActive() --> SecondAbility.onBackground() --> SecondAbilitySlice.onBackground() --> SecondAbility.onStop() --> SecondAbilitySlice.onStop()

6、关闭MainAbility的MainAbilitySlice，生命周期的调用顺序为：
MainAbility.onStart() --> MainAbilitySlice.onInactive()

Page Ability生命周期

Page 生命周期回调

AbilitySlice生命周期

页面跳转的生命周期回调

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