java - 创建模板布局文件并动态添加值以将其添加到首选项

Question

我正在创建一个首选项活动，其中我使用片段来添加首选项。我正在尝试创建一个模板布局文件，并以某种方式动态地将数据添加到布局文件中并将其添加到首选项中。这不起作用，有什么想法吗？

模板 xml 文件 -preference_dynamic_layout.xml

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/preference_dynamic_rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/kumbai"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="565"
        android:background="@color/gray" />

</RelativeLayout>

SettingsFragment.java

    public class SettingsFragment extends PreferenceFragment {

    PreferenceCategory preferenceCategory;
    PreferenceScreen preferenceScreen;

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        addPreferencesFromResource(R.xml.preferances);

        preferenceScreen = this.getPreferenceScreen();
        preferenceCategory = new PreferenceCategory(preferenceScreen.getContext());


        Intent intent = new Intent(getActivity(), GeneratePreference.class);
        startActivityForResult(intent, 565);

    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == 565) {
            if (resultCode == RESULT_OK) {
                int returnString = data.getIntExtra("resID", 0);
                int ss = R.layout.preference_notification_title;
                preferenceCategory.setLayoutResource(returnString);
                preferenceScreen.addPreference(preferenceCategory);
            }
        }
    }
}

生成偏好.java

    public class GeneratePreference extends AppCompatActivity {
    String text = "Kumbaiiii.....";
    RelativeLayout relativeLayout;
    TextView textView;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.preference_dynamic_layout);
        relativeLayout = findViewById(R.id.preference_dynamic_rl);
        textView = findViewById(R.id.kumbai);
//        textView = new TextView(getApplicationContext());
        textView.setText(text);

        synchronized (relativeLayout){
            relativeLayout.notify();
            relativeLayout.notifyAll();
        }

//        relativeLayout.addView(textView);

        Intent intent = new Intent();
        Bundle bundle = new Bundle();
        bundle.putInt("resID", R.layout.preference_dynamic_layout);
        intent.putExtras(bundle);
        setResult(RESULT_OK, intent);
        finish();
    }


    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public int getLayout() {
        return relativeLayout.getId();
    }
}

运行后将布局添加到首选项，但值未更新

标签： javaandroidandroid-fragmentsandroid-preferences

Answer 1

我们可以使用自定义布局并动态设置值。使用以下 XML 并确保元素的 id 保持不变。 标题、摘要、图标。

preference_custom_child.xml

  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:minHeight="?android:attr/listPreferredItemHeight"
android:paddingStart="16dip"
android:paddingEnd="?android:attr/scrollbarSize">

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="horizontal">

    <ImageView
        android:id="@android:id/icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"/>
</LinearLayout>

<RelativeLayout
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="6dip"
    android:layout_marginEnd="6dip"
    android:layout_marginBottom="6dip"
    android:layout_weight="1">

    <TextView
        android:id="@android:id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ellipsize="marquee"
        android:fadingEdge="horizontal"
        android:fontFamily="@font/questrial_regular"
        android:singleLine="true"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="@color/black"
        android:textStyle="bold" />

    <TextView
        android:id="@android:id/summary"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@android:id/title"
        android:paddingStart="10dp"
        android:layout_alignStart="@android:id/title"
        android:fontFamily="@font/questrial_regular"
        android:maxLines="4"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:textColor="@color/grayDark"/>
</RelativeLayout>
<!-- Preference should place its actual preference widget here. -->
<LinearLayout
    android:id="@android:id/widget_frame"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:animateLayoutChanges="true"
    android:gravity="center"
    android:orientation="vertical" />
</LinearLayout>

采用，

        .setLayoutResource(R.layout.preference_custom_child);