HarmonyOS开始玩耍：常用的方法整理列出和对应案例（五）

常用方法：

1. HiLog日志输出：

HiLog.info(LABEL, "This is an info log.");
HiLog.error(LABEL, "This is an error log.");

2. Bundle数据传递：

// 发送数据
Bundle bundle = new Bundle();
bundle.putString("key", "value");

// 接收数据
String value = bundle.getString("key");

3. 权限管理：

// 请求权限
PermissionManager permissionManager = new PermissionManager(context);
permissionManager.requestPermissionsFromUser(new String[]{PermissionConstants.CAMERA}, new PermissionCallback() {
    @Override
    public void onPermissionGranted() {
        // 权限已授予
    }

    @Override
    public void onPermissionDenied() {
        // 权限被拒绝
    }
});

4. 网络请求：

HttpURLConnection connection = new HttpURLConnection();
connection.setUrl("http://example.com/api/data");
connection.setRequestMethod("GET");
connection.connect();
InputStream inputStream = connection.getInputStream();

5. 数据存储：

Preferences preferences = new Preferences(context);
preferences.putString("key", "value");

String value = preferences.getString("key", "default_value");

6. 创建页面：

import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;

public class MyAbilitySlice extends AbilitySlice {
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);
    }
}

7. 权限请求：

import ohos.security.SystemPermission;

if (verifySelfPermission(SystemPermission.CAMERA) != IBundleManager.PERMISSION_GRANTED) {
    requestPermissionsFromUser(new String[]{SystemPermission.CAMERA}, 0);
}

8. UI交互：

import ohos.agp.components.Text;
import ohos.agp.components.Component;

Text text = new Text(getContext());
text.setText("Hello, HarmonyOS!");
layout.addComponent(text);

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