android开发常见bug及解决方案汇总

来源：互联网发布：剧情紧凑的电影知乎编辑：程序博客网时间：2024/06/04 17:49

一、滑动冲突

1、ScrollView和ViewPager

public class CustomScrollView extends ScrollView {    private float xDistance, yDistance, xLast, yLast;    public CustomScrollView(Context context) {        super(context);    }    public CustomScrollView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public CustomScrollView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }    @Override    public boolean onInterceptTouchEvent(MotionEvent ev) {        switch (ev.getAction()) {            case MotionEvent.ACTION_DOWN:                xDistance = yDistance = 0f;                xLast = ev.getX();                yLast = ev.getY();                break;            case MotionEvent.ACTION_MOVE:                final float curX = ev.getX();                final float curY = ev.getY();                xDistance += Math.abs(curX - xLast);                yDistance += Math.abs(curY - yLast);                xLast = curX;                yLast = curY;                if (xDistance > yDistance) {                    return false;                }        }        return super.onInterceptTouchEvent(ev);    }}

2、两个HorizontalScrollView同步滑动

/** * 监听滑动事件，解决两个HorizontalScrollView的同步滑动 */public class ObservableScrollView extends HorizontalScrollView {    private ScrollViewListener scrollViewListener = null;    public ObservableScrollView(Context context) {        super(context);    }    public ObservableScrollView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public ObservableScrollView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }    public void setScrollViewListener(ScrollViewListener scrollViewListener) {        this.scrollViewListener = scrollViewListener;    }    @Override    protected void onScrollChanged(int l, int t, int oldl, int oldt) {        super.onScrollChanged(l, t, oldl, oldt);        if (scrollViewListener != null) {            scrollViewListener.onScrollChanged(this, l, t, oldl, oldt);        }    }    public static interface ScrollViewListener {        void onScrollChanged(ObservableScrollView scrollView, int l, int t, int oldl, int oldt);    }}

在Activity里的代码调用：

ObservableScrollView observableScrollView1;ObservableScrollView observableScrollView2;ObservableScrollView.ScrollViewListener scrollViewListener=new  ObservableScrollView.ScrollViewListener{   @Override    public void onScrollChanged(ObservableScrollView scrollView, int l, int t, int oldl, int oldt) {        if (scrollView == observableScrollView1) {            observableScrollView2.scrollTo(l, t);        } else if (scrollView == observableScrollView2) {            observableScrollView1.scrollTo(l, t);        }    }};observableScrollView1.setScrollViewListener(scrollViewListener);observableScrollView2.setScrollViewListener(scrollViewListener);

二、ScrollView、ListView、GridView 嵌套显示不完整

1、GridView嵌套显示不完整

public class CustomGridView extends GridView {    public CustomGridView(Context context) {        super(context);    }    public CustomGridView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public CustomGridView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }    /**     * 设置不滚动     */    @Override    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);        super.onMeasure(widthMeasureSpec, expandSpec);    }}

2、ScrollView嵌套GridView ，ScrollView定位不准，UI抖动

gridView .setFocusable(false);new Handler().post(new Runnable() {                @Override                public void run() {                    scrollView.smoothScrollTo(0, 1);                }            });

三、网络图片自适应（通常应用于图片宽度全屏，高度等比例自适配）

XML布局文件ImageView属性设置：

 <ImageView            android:id="@+id/image"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:adjustViewBounds="true"            android:scaleType="centerCrop"            android:src="@drawable/default"            />

1、单张图片显示、ListView图片列表显示

java代码：

ImageView imageView = (ImageView) findViewById(R.id.image);ViewGroup.LayoutParams lp = imageView.getLayoutParams();lp.width = screenWidth;//屏幕宽度lp.height = lp.width * 258 / 640;//图片宽高imageView.setLayoutParams(lp);imageView.setImageDrawable(getResources().getDrawable(R.drawable.default));//默认占位图

2、ViewPager图片滑动显示

XML布局文件ViewPager属性设置：

   <android.support.v4.view.ViewPager                    android:id="@+id/viewpager"                    android:layout_width="match_parent"                    android:layout_height="wrap_content"                    />

java代码：

        ViewPager viewPager = (ViewPager) findViewById(R.id.viewpager);        viewPager.setAdapter(PagerAdapter);        viewPager.setOnPageChangeListener(this);        ViewGroup.LayoutParams lp = viewPager.getLayoutParams();        lp.width = screenWidth;//<span style="font-family: Arial, Helvetica, sans-serif;">屏幕宽度</span>        lp.height = lp.width * 258 / 640;<span style="font-family: Arial, Helvetica, sans-serif;">//图片宽高</span>        viewPager.setLayoutParams(lp);

在PagerAdapter的instantiateItem()方法中：

ImageView imageView = (ImageView) findViewById(R.id.image);ViewGroup.LayoutParams lp = imageView.getLayoutParams();lp.width = screenWidth;//屏幕宽度lp.height = lp.width * 258 / 640;//图片宽高imageView.setLayoutParams(lp);imageView.setImageDrawable(getResources().getDrawable(R.drawable.default));//默认占位图

四、

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