您的位置:首页 > 移动开发 > Android开发

Android开发中创建自定义Dialog的方法

2014-01-20 15:56 465 查看
Android开发中创建自定义Dialog的关键只有两个步骤:

  1.创建一个需要在自定义Dialog显示的自定义View,创建这个自定义View时,既可以在这个View的构造方法中用Android开发自带的控件把自定义View构造出来;也可以在自定义View的@Override protected void onDraw(Canvas canvas)方法中,把自定义View绘制出来

  2.在自定义Dialog的@Override protected void onCreate(Bundle savedInstanceState)方法中,通过setContentView(自定义View);方法,把我们的自定义View显示出来

  在创建好自定义Dialog后,我们在别的类中,只要调用自定义Dialog的构造函数就可以把自定义Dialog显示出来。对于ColorPickerDialog这个类,调用语句如下:new ColorPickerDialog(getContext(), listener, mPaint.getColor()).show();

  下面提供一个Android开发在自定义View的构造函数中把View构造出来的例子:

  /**

  * 文字对话框

  */

  public class TextDialog extends Dialog implements SeekBar.OnSeekBarChangeListener{

  private LinearLayout linearLayout;

  private EditText etForText;

  private SeekBar seekBar;

  private TextView tvForSeekBar;

  private Button btnOk;

  private Button btnCancel;

  private LinearLayout topChildLinearLayout;

  private LinearLayout bottomChildLinearLayout;

  private OnTextInputListener mListener;

  /**

  * 文字对话框标题

  */

  private String title = "请输入文字与选择文字大小";

  public interface OnTextInputListener {

  void textInput(String text, int textSize);

  }

  public TextDialog(Context context, OnTextInputListener listener)

  {

  super(context);

  mListener = listener;

  linearLayout = new LinearLayout(getContext());

  linearLayout.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));

  linearLayout.setOrientation(LinearLayout.VERTICAL);

  linearLayout.setGravity(Gravity.CENTER);

  etForText = new EditText(context);

  etForText.setMinLines(5);//设置最大行数

  seekBar = new SeekBar(context);

  seekBar.setLayoutParams(new LinearLayout.LayoutParams(200, LayoutParams.FILL_PARENT));

  seekBar.setMax(100);

  seekBar.setProgress(50);

  seekBar.setOnSeekBarChangeListener(this);

  tvForSeekBar = new TextView(context);

  tvForSeekBar.setText("50");

  btnOk = new Button(getContext());

  btnOk.setText("确定");

  btnCancel = new Button(getContext());

  btnCancel.setText("取消");

  linearLayout.addView(etForText);

  topChildLinearLayout = new LinearLayout(getContext());

  topChildLinearLayout.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

  topChildLinearLayout.setOrientation(LinearLayout.HORIZONTAL);

  topChildLinearLayout.addView(seekBar);

  topChildLinearLayout.addView(tvForSeekBar);

  linearLayout.addView(topChildLinearLayout);

  bottomChildLinearLayout = new LinearLayout(getContext());

  bottomChildLinearLayout.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

  bottomChildLinearLayout.setOrientation(LinearLayout.HORIZONTAL);

  bottomChildLinearLayout.setGravity(Gravity.CENTER);

  bottomChildLinearLayout.addView(btnOk);

  bottomChildLinearLayout.addView(btnCancel);

  linearLayout.addView(bottomChildLinearLayout);

  btnOk.setOnClickListener(new View.OnClickListener()

  {

  @Override

  public void onClick(View v)

  {

  // TODO Auto-generated method stub

  //验证text是否为空

  String text = etForText.getText().toString()/*.replace("\n", "")*/;

  if(text == null || text.trim().equals(""))

  {

  Toast.makeText(getContext(), "文字不能为空", Toast.LENGTH_SHORT).show();

  return;

  }

  int textSizeInt = Integer.valueOf(tvForSeekBar.getText().toString());

  mListener.textInput(text, textSizeInt);

  dismissDialog();

  }

  });

  btnCancel.setOnClickListener(new View.OnClickListener()

  {

  @Override

  public void onClick(View v)

  {

  // TODO Auto-generated method stub

  dismissDialog();

  }

  }

  }

  @Override

  protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(linearLayout);

  setTitle(title);

  }

  public void dismissDialog()

  {

  this.dismiss();

  }

  @Override

  public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)

  {

  // TODO Auto-generated method stub

  tvForSeekBar.setText(progress + "");

  }

  @Override

  public void onStartTrackingTouch(SeekBar seekBar

  {

  // TODO Auto-generated method stub

  }

  @Override

  public void onStopTrackingTouch(SeekBar seekBar)

  {

  // TODO Auto-generated method stub

  }

  }
内容来自用户分享和网络整理,不保证内容的准确性,如有侵权内容,可联系管理员处理 点击这里给我发消息
标签: 
相关文章推荐