Question

我在TextViews中有4个GridView，其中包含给定Fragment中的自定义适配器。我的主Activity会通过TimerTask收到通知，以更新正确TextView的文字颜色。除了应用程序首次启动时的第一个TextViews之外，这适用于所有TextViews。之后它会像Fragment的其余部分一样正常工作。

问题public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment View view = inflater.inflate(R.layout.short_press_info_fragment, container, false); GridView grid = (GridView) view.findViewById(R.id.grid_view); infoAdapter = new ShortPressInfoAdapter(mKeyInfo, getActivity()); grid.setAdapter(infoAdapter); return view; }：

public View getView(int position, View convertView, ViewGroup parent) {
    View v = convertView;
    if(convertView == null) {
        Log.d("GRID_VIEW", "inflating");
        LayoutInflater li = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = li.inflate(R.layout.grid_item, null);
        TextView text = texts[position] = (TextView) v.findViewById(R.id.gridItemText);
        Log.d("GRID_VIEW", "creating view");
        text.setText(mKeyInfo[position]);
        switch(position) {
        case 0:
            text.setBackgroundColor(mContext.getResources().getColor(R.color.blue));
            break;
        case 1:
            text.setBackgroundColor(mContext.getResources().getColor(R.color.yellow));
            break;
        case 2:
            text.setBackgroundColor(mContext.getResources().getColor(R.color.green));
            break;
        case 3:
            text.setBackgroundColor(mContext.getResources().getColor(R.color.red));
            break;
        default:
            break;
        }
    }
    return v;
}

在适配器中：

Activity

在主public void emphasizeShort(final PressID p, final boolean b) { runOnUiThread(new Runnable() { @Override public void run() { if(b) { Log.d(TAG, "setting short " + p + " to black"); getShortTextView(p).setTextColor(getResources().getColor(R.color.black)); } else { Log.d(TAG, "setting short " + p + " to white"); getShortTextView(p).setTextColor(getResources().getColor(R.color.white)); } } }); }：

TextView

日志向我显示相同的输出，无论我在应用程序启动时尝试更改哪个TextView，但第一个View是唯一一个不会更改的内容。

什么会导致TextView在应用启动时忽略更改而不是之后？从这段代码中我不明白为什么第一个TextView被挑选出来。

非常感谢任何帮助。

编辑：这是发送请求以强调@Override public boolean onTouch(final View v, final MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { // button pressed pressTime = System.currentTimeMillis(); timer = new Timer(); timer.schedule(new TimerTask() { @Override public void run() { Log.d("TIMER_TASK", "short press " + (System.currentTimeMillis() - pressTime)); mFourButtonListener.onShortPress(buttonID); } }, SHORT_PRESS_DELAY); timer.schedule(new TimerTask() { @Override public void run() { Log.d("TIMER_TASK", "long press " + (System.currentTimeMillis() - pressTime)); mFourButtonListener.onLongPress(buttonID); } }, LONG_PRESS_DELAY); return true; } else if (event.getAction() == MotionEvent.ACTION_UP) { duration = System.currentTimeMillis() - pressTime; timer.cancel(); timer.purge(); if (duration >= SHORT_PRESS_DELAY && duration < LONG_PRESS_DELAY) mFourButtonListener.onShortRelease(buttonID); else if (duration >= LONG_PRESS_DELAY) mFourButtonListener.onLongRelease(buttonID); return true; } return false; } } s。

的函数

{{1}}

我变得绝望了。

Answer 1

这里有很多遗漏的代码，但是如果你在应用首次启动时遇到问题，那么问题很可能是由runOnUiThread造成的，这在启动时根本不可靠。（即并非所有发布的任务都能保证运行。）

添加班级Handler变量

Handler h;

并在onCreate

期间创建它

h = new Handler();

然后使用h.post()代替runOnUiThread。

Answer 2

如果没有。 TextView的{{1}}将保持4，无论不使用GridView。请改用LineareLayout。无论如何，如果添加更多TextView s，您当前的方法将停止工作。乍一看你的getView()有问题，你必须这样做：

public View getView(int position, View convertView, ViewGroup parent) {
    View v = convertView;
    if(convertView == null) {
        Log.d("GRID_VIEW", "inflating");
        LayoutInflater li = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = li.inflate(R.layout.grid_item, null);
    } // <<<<------------------- 
    TextView text = (TextView) v.findViewById(R.id.gridItemText);
    Log.d("GRID_VIEW", "creating view");
    text.setText(mKeyInfo[position]);
    switch(position) {
    case 0:
        text.setBackgroundColor(mContext.getResources().getColor(R.color.blue));
        break;
    case 1:
        text.setBackgroundColor(mContext.getResources().getColor(R.color.yellow));
        break;
    case 2:
        text.setBackgroundColor(mContext.getResources().getColor(R.color.green));
        break;
    case 3:
        text.setBackgroundColor(mContext.getResources().getColor(R.color.red));
        break;
    default:
        break;
    } 
    return v;
}

基本上，由于getView()回收，每次调用View时，您必须执行所有与状态相关的操作。

BTW为什么要在texts数组中保留对自己的引用？它非常糟糕的做法。你为什么需要这个？

如果您想在稍后阶段更改颜色，则需要更改整个逻辑。你需要做类似的事情：

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

public class MyAdapter extends BaseAdapter {

int[] colors = new int[4];

public MyAdapter(Context context) {
    colors[0] =  context.getResources().getColor(R.color.blue);
    colors[1] =  context.getResources().getColor(R.color.yellow);
    colors[2] =  context.getResources().getColor(R.color.green);
    colors[3] =  context.getResources().getColor(R.color.red);
}

@Override
public int getCount() { 
    return colors.length;
}

@Override
public Object getItem(int position) { 
    return colors[position];
}

@Override
public long getItemId(int position) { 
    return position;
}

public View getView(int position, View convertView, ViewGroup parent) {
    View v = convertView;
    if(convertView == null) {
        Log.d("GRID_VIEW", "inflating");
        LayoutInflater li = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = li.inflate(R.layout.grid_item, null);
    } // <<<<------------------- 
    TextView text = (TextView) v.findViewById(R.id.gridItemText);
    Log.d("GRID_VIEW", "creating view");
    text.setText(mKeyInfo[position]);
    text.setBackgroundColor(colors[position]); 
    return v;
}
// call this method to change colors at later stage
public void changeColor(int position, int color){
    colors[position] = color;
    notifyDataSetChanged();
}

// call this method to change text at later stage
public void changeText(int position, String text){
    mKeyInfo[position] = text;
    notifyDataSetChanged();
}
}

GridView中的特定TextView未在app init上更新

2 个答案: