Question

所以我正在开发一款Android应用，并试图以编程方式添加点击触发Dialog的按钮。

当我将OnClickListener添加到这些按钮时，我要么从最后添加的Button获取文本，这是一个错误，声称在调用tv1.setText时存在IOOBException（... ） - 索引7无效，大小为7，或者只是没有传递。有没有人知道我如何设置每个Button来为每个按钮创建一个包含唯一信息的新Dialog？

提出问题的代码片段：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_all_streaks);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    prefs = getSharedPreferences("carter.streakly", Context.MODE_PRIVATE);
    editor = prefs.edit();

    db = new DatabaseHelper(this);
    mTableLayout = (TableLayout) findViewById(R.id.all_streak_table);
    res = db.getAllData();
    if(res.getCount() ==0) {
        //show message
        showMessage("Error", "Nothing found");
        return;
    }

    streakArrayList = new ArrayList<>();

    int counter = 0;
    while (res.moveToNext()){
        streakArrayList.add(new Streak(Integer.parseInt(res.getString(0)), res.getString(1), res.getString(2), res.getString(3), Integer.parseInt(res.getString(4))));
        counter++;
    }

    LinearLayout.LayoutParams btnParams = new LinearLayout.LayoutParams(200, 200);
    btnParams.setMargins(200, 30, 80, 30);

    LinearLayout.LayoutParams tvParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ActionBar.LayoutParams.WRAP_CONTENT);
    tvParams.setMargins(100, 0, 0, 0);

    i = 0;
    while (i < counter){
        if(i%2==0){
            mTableRow = new TableRow(this);
            mTableLayout.addView(mTableRow);
        }

        ll = new LinearLayout(this);
        ll.setOrientation(LinearLayout.VERTICAL);
        mTableRow.addView(ll);

        Button btn = new Button(this);
        btn.setText(""+streakArrayList.get(i).getDaysKept());
        btn.setId(i);
        btn.setBackground(getResources().getDrawable(R.drawable.round_button));
        btn.setLayoutParams(btnParams);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Dialog dialog = new Dialog(AllStreaks.this);
                dialog.setContentView(R.layout.activity_enlarged);

                tv1 = (TextView) dialog.findViewById(R.id.activity_enlarge_icon);
                tv1.setText(streakArrayList.get(i-1).getActivityName());
                dialog.show();
                /*
                Intent intent = new Intent(AllStreaks.this, EnlargedActivity.class);
                intent.putExtra("passName", streakArrayList.get(view.getId()).getActivityName());
                startActivity(intent);*/
            }
        });

        ll.addView(btn);

        TextView tv = new TextView(this);
        tv.setText(streakArrayList.get(i).getActivityName());
        tv.setId(i);
        tv.setGravity(Gravity.CENTER | Gravity.BOTTOM);
        tv.setTextSize(20);
        tv.setLayoutParams(tvParams);
        ll.addView(tv);

        i++;
    }
}

public void showMessage(String title, String message){
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setCancelable(true);
    builder.setTitle(title);
    builder.setMessage(message);
    builder.show();
}

Answer 1

您的代码存在许多问题。

首先，您使用的是TableRow和LinearLayout的全局实例。这意味着你在循环的每次迭代时都会覆盖它们，所以最后只有最后一次迭代的值才会可见。

您为Button和TextView提供相同的ID，它们应该是唯一的。

使用counter变量是完全没必要的，您只需使用for循环来遍历streakArrayList。

这样的事情：

for (Streak streak : streakArrayList) {
    TableRow mTableRow = new TableRow(this);
    LinearLayout ll = new LinearLayout(this);
    ll.setOrientation(LinearLayout.VERTICAL);

    final String activityName = streak.getActivityName();

    Button btn = new Button(this);
    btn.setText("" + streak.getDaysKept());
    btn.setId(aUniqueId);
    btn.setBackground(getResources().getDrawable(R.drawable.round_button));
    btn.setLayoutParams(btnParams);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Dialog dialog = new Dialog(AllStreaks.this);
            dialog.setContentView(R.layout.activity_enlarged);

            tv1 = (TextView) dialog.findViewById(R.id.activity_enlarge_icon);
            tv1.setText(activityName);
            dialog.show();
        }
    });

    TextView tv = new TextView(this);
    tv.setText(activityName);
    tv.setId(anotherUniqueId);
    tv.setGravity(Gravity.CENTER | Gravity.BOTTOM);
    tv.setTextSize(20);
    tv.setLayoutParams(tvParams);

    ll.addView(btn);
    ll.addView(tv);

    mTableRow.addView(ll);
    mTableLayout.addView(mTableRow);
}

以编程方式设置按钮文本将自动转到上一个索引

1 个答案: