android - ScrollView 不工作它只显示空 View

Question

我正在尝试在 ScrollView 中添加一个 TextView ，然后以编程方式将此 ScrollView 添加到相对布局，但它只显示空 View ，即使仅将 TextView 添加到相对布局也是如此。

    TextView aboutTextView = new TextView(this);
    aboutTextView.setText(R.string.aboutText);

    aboutTextView.setId(5);
    aboutTextView.setLayoutParams(new LayoutParams(
            LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));

    ScrollView scroll = new ScrollView(this);
    scroll.setPadding(R.dimen.scroll_padding, R.dimen.scroll_padding,
            R.dimen.scroll_padding, R.dimen.scroll_padding);
    scroll.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
            LayoutParams.FILL_PARENT));
    scroll.addView(aboutTextView);

    RelativeLayout fragmentContainer = (RelativeLayout) findViewById(R.id.fragmentContainer);
    fragmentContainer.addView(scroll);

Answer 1

试试这段代码。我希望它有用。

1) Java代码

package com.temp;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.ViewGroup.LayoutParams;
import android.widget.RelativeLayout;
import android.widget.ScrollView;
import android.widget.TextView;

public class MainActivity extends Activity {

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

    TextView aboutTextView = new TextView(this);
    aboutTextView
            .setText("Temp Text Temp Text Temp");

    aboutTextView.setId(5);
    aboutTextView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));

    ScrollView scroll = new ScrollView(this);
    scroll.setPadding(5, 5, 5, 5);
    scroll.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
    scroll.addView(aboutTextView);

    RelativeLayout fragmentContainer = (RelativeLayout) findViewById(R.id.fragmentContainer);
    fragmentContainer.addView(scroll);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

}

2) XML代码

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <RelativeLayout
        android:id="@+id/fragmentContainer"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        >
    </RelativeLayout>

</RelativeLayout>

Place of Temp Text Temp Text Temp 放置您的文本。
它对我有用。检查一下。

谢谢。