Android:如何以编程方式设置片段的边距?

Dan*_*hov 5 java android android-layout android-fragments

因此,我需要为片段容器(它是 RelativeLayout 内的 FrameLayout)设置左边距,以便它按照我需要的方式进行缩放。因此,我想在 java 中执行此操作(尽管其余与视图相关的内容是在 xml 中完成的),但我不确定如何处理它。我应该为我的片段创建一个新的通用类吗?还是应该在活动课上做?如果是这样,它是否必须在特定的地方?

这是我的活动课:

public class LoginActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    if (findViewById(R.id.fragment_container) != null) {
        if (savedInstanceState != null)
            return;


        AuthFragment firstFragment = new AuthFragment();
        firstFragment.setArguments(getIntent().getExtras());
     getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, firstFragment).commit();
    }

}
Run Code Online (Sandbox Code Playgroud)

和活动布局:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/app_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/navy">

    <com.kupol24.app.view.MyImageView
        android:id="@+id/image_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"/>

    <FrameLayout
        android:id="@+id/container_holder"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_marginLeft="@dimen/fragment_margin"
        android:layout_centerVertical="true">

        <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/fragment_container"
            android:layout_gravity="center"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>

    </FrameLayout>
</RelativeLayout>
Run Code Online (Sandbox Code Playgroud)

Gas*_*res 5

也许这会很有用,尝试为 Framelayout(或相对)设置边距:

final FrameLayout frameLayout = (FrameLayout)findViewById(R.id.fragment_container);

FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) frameLayout.getLayoutParams();
//left, top, right, bottom
params.setMargins(10, 10, 10, 10);
frameLayout.setLayoutParams(params);
Run Code Online (Sandbox Code Playgroud)

(已编辑)我不知道要执行您的代码,但我会这样做:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);

    final FrameLayout frameLayout = (FrameLayout) findViewById(R.id.fragment_container);
    if ((frameLayout != null) && (savedInstanceState == null)) {
        final AuthFragment firstFragment = new AuthFragment();
        firstFragment.setArguments(getIntent().getExtras());
        getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, firstFragment).commit();
        FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) frameLayout.getLayoutParams();
        //left, top, right, bottom
        params.setMargins(10, 0, 0, 0); //setting margin left to 10px
        frameLayout.setLayoutParams(params);
    }
}
Run Code Online (Sandbox Code Playgroud)