ScrollView的高度不適合其內容-Android Java

Question

我有一個ScrollView，我想在上面添加2張圖像。
我創建了ScrollView，然后創建了LinearLayout。 然后創建2個ImageViews並將它們添加到LinearLayout上。 然后在ScrollView上添加LinearLayout。 （所有步驟均由Java代碼完成。根本不使用XML）
但是問題是ScrollView的高度不適合我圖像的高度（太長）。
這是我的代碼：

LinearLayout scrollParent = new LinearLayout(this);
    scrollParent.setOrientation(LinearLayout.VERTICAL);
    scrollParent.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));

    helpView = new ScrollView(this);
    helpView.setLayoutParams(new ScrollView.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.WRAP_CONTENT));
    helpView.setFillViewport(true);

    inside = new LinearLayout(this);
    inside.setOrientation(LinearLayout.VERTICAL);
    inside.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.WRAP_CONTENT));

    helpView.addView(inside);

    ImageView img = new ImageView(this);
    img.setImageResource(R.drawable.learn1);
    img.setLayoutParams(new ScrollView.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.WRAP_CONTENT));



    ImageView img2 = new ImageView(this);
    img2.setImageResource(R.drawable.learn2);
    img2.setLayoutParams(new ScrollView.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.WRAP_CONTENT));


    inside.addView(img);
    inside.addView(img2);
    scrollParent.addView(helpView);

謝謝你的幫助。

Answer 1

嘗試這個...

activity_demo.xml

<LinearLayout
    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"
    android:orientation="vertical"
    android:id="@+id/myLinear"
    tools:context="com.example.ricardo.demo.Demo">


</LinearLayout>

Demo.java

package com.example.ricardo.demo;

import android.app.Activity;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ScrollView;


public class Demo extends Activity {

    private ScrollView helpView = null;
    private LinearLayout inside = null, myLinear = null;

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

        myLinear = (LinearLayout) findViewById(R.id.myLinear);
        showImages();
    }

    private void showImages(){
        helpView = new ScrollView(this);
        helpView.setLayoutParams(new ScrollView.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT));
        helpView.setFillViewport(true);

        inside = new LinearLayout(this);
        inside.setOrientation(LinearLayout.VERTICAL);
        inside.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT));

        helpView.addView(inside);

        ImageView img = new ImageView(this);
        img.setImageResource(R.drawable.image1);
        img.setLayoutParams(new ScrollView.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT));
        img.setScaleType(ImageView.ScaleType.FIT_XY);
        inside.addView(img);

        ImageView img2 = new ImageView(this);
        img2.setImageResource(R.drawable.image2);
        img2.setLayoutParams(new ScrollView.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT));
        img2.setScaleType(ImageView.ScaleType.FIT_XY);
        inside.addView(img2);

        myLinear.addView(helpView);

    }

}

Answer 2

我認為您指定了錯誤的layoutParams類型，應為要放置子項的viewGroup指定一個layoutParam。嘗試如下：

// I don't know which type of layout is the parent of scrollParent, 
// but you should set its layoutParams as well, from your code 
// i assume that is LinearLayout
LinearLayout scrollParent = new LinearLayout(this);
scrollParent.setOrientation(LinearLayout.VERTICAL);
scrollParent.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));

helpView = new ScrollView(this);
helpView.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.WRAP_CONTENT));
helpView.setFillViewport(true);

inside = new LinearLayout(this);
inside.setOrientation(LinearLayout.VERTICAL);
inside.setLayoutParams(new ScrollView.LayoutParams(ScrollView.LayoutParams.MATCH_PARENT,
            ScrollView.LayoutParams.WRAP_CONTENT));

helpView.addView(inside);

ImageView img = new ImageView(this);
img.setImageResource(R.drawable.learn1);
img.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.WRAP_CONTENT));


ImageView img2 = new ImageView(this);
img2.setImageResource(R.drawable.learn2);
img2.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,
            LinearLayout.LayoutParams.WRAP_CONTENT));

inside.addView(img);
inside.addView(img2);
scrollParent.addView(helpView);