（1）点击事件

private void initView() {
    mbtnst= (Button) findViewById(R.id.btndialog);
    mbtnst.setOnClickListener(this);

}

@Override
public void onClick(View v) {
    switch(v.getId()){
        case R.id.btndialog:
            //创建对话框的builder对象
            AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
            builder.setTitle("我是标题！");
            builder.setMessage("我是消息messa！");
            builder.setIcon(R.drawable.cat);

            builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    Toast.makeText(MainActivity.this, "点击了确定", Toast.LENGTH_SHORT).show();
                }
            });

            builder.setNegativeButton("否定", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    Toast.makeText(MainActivity.this, "点击了否定", Toast.LENGTH_SHORT).show();
                }
            });

            builder.show();
            break;
    }
}

（2）长按事件

public class MainActivity extends AppCompatActivity implements View.OnClickListener,View.OnLongClickListener{

private void initView() {
    mbtnmy= (Button) findViewById(R.id.mydialog);
   mbtnmy.setOnLongClickListener(this);
}

@Override
public boolean onLongClick(View v) {
    Toast.makeText(MainActivity.this,"长按事件",Toast.LENGTH_LONG).show();
    return true;
}

（3）按键事件

private void initView() {

    metin= (EditText) findViewById(R.id.etin);
    metin.setOnKeyListener(this);
}

public class MainActivity extends AppCompatActivity implements View.OnClickListener,
        View.OnLongClickListener,View.OnKeyListener{

@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
    switch (event.getAction()){
        case KeyEvent.ACTION_DOWN:
            Toast.makeText(MainActivity.this,"按键落下",Toast.LENGTH_LONG).show();
            break;
        case KeyEvent.ACTION_UP:
            EditText et= (EditText) v;
            Toast.makeText(MainActivity.this,"按键弹起,键入的是："+et.getText().toString(),
                    Toast.LENGTH_LONG).show();
            break;
        default:
            break;
    }

    return false;
}