android - 在 main.xml 中创建一个按钮

Question

我只想制作这段代码，我有一个按钮，但是当我单击该按钮时，我想要一个计时器启动..并且每个计时器滴答声都会在 main.xml 中创建一个按钮..我该怎么做？请帮帮我先生！

  Button a = (Button) findViewById(R.id.button1);
 a.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        new CountDownTimer(5000,1000) {

            @Override
            public void onTick(long millisUntilFinished) {
                // TODO Auto-generated method stub
                //how to create a button here!
            }

            @Override
            public void onFinish() {
                // TODO Auto-generated method stub

            }
        }.start();
    }
});

我试试这个..但是当我点击按钮时出现这个词（“不幸的是程序已停止”）

  final int i=1;
    Button a = (Button) findViewById(R.id.button1);
    a.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        new CountDownTimer(5000,1000) {

            @Override
            public void onTick(long millisUntilFinished) {
                // TODO Auto-generated method stub
                //how to create a button here!
                LinearLayout linearLayout = (LinearLayout) findViewById(R.layout.main);
                Button btn = new Button(NyaActivity.this);
                btn.setId(i+1);
                linearLayout.addView(btn);
                btn.setText("Button"+(i+1));
                final int index = i;
                btn.setOnClickListener(new View.OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        // TODO Auto-generated method stub
                        Log.i("TAG", "The index is" + index);
                    }
                });


            }

            @Override
            public void onFinish() {
                // TODO Auto-generated method stub

            }
        }.start();
    }
});
}

Answer 1

尝试以这种方式在 CountDownTimer onTick 上动态添加按钮：

    int i=1;
    Button a = (Button) findViewById(R.id.button1);
    a.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        new CountDownTimer(5000,1000) {

            @Override
            public void onTick(long millisUntilFinished) {
                // TODO Auto-generated method stub
                //how to create a button here!
                LinearLayout linearLayout = (LinearLayout) findViewById(R.id.mainlauoutid);
                Button btn = new Button(Your_Current_Activity.this);
                btn.setId(i+1);
                btn.setText("Button"+(i+1));
                btn.setLayoutParams(lprams);
                final int index = i;
                btn.setOnClickListener(new OnClickListener() {
                    void onClick(View v) {
                        Log.i("TAG", "The index is" + index);
                    }
                });
                linearLayout.addView(btn);
            }

            @Override
            public void onFinish() {
                // TODO Auto-generated method stub

            }
        }.start();
    }
});

你的布局看起来像：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/mainlauoutid"
    android:orientation="vertical" >
.....

Answer 2

在 main.xml 中创建 LinearLayout 并在 a.setOnClickListener 之前使用：

final LinearLayout layout = (LinearLayout) findViewById(R.id.layoutId);

然后在 onTick() 调用中：

Button newBtn = new Button(YourActivity.this);
newBtn.setText("new button");
layout.addView(newBtn);