常用控件的使用方法

1.TextView:




  match_parent：当前控件大小和父布局一样




  wrap_parent:控件大小刚好包住内容




  anroid:gravity="center" :居中









  2.EditText:




  anroid:hint="Type something here" //提示性文本




  anroid:maxLines="2" //最大行数，文本向上滚动









  3.ImageView:




  anroid:src //picture's location




  imageView.setImageResource(R.drawable.flower) //点击按钮切换图片




  in android studio the image's format must .png









  4.ProgressBar:




   设置控件是否可见:




   if(progressBar.getVisibility() == View.GONE){




                      progressBar.setVisibility(View.VISIBLE);




       }else{




                       progressBar.setVisibility(View.GONE);




                   }




  加减进度条:




                   int progress = progressBar.getProgress();




                   progress += 10;




                   progressBar.setProgress(progress);









  样式： style="?android:attr/progressBarStyleHorizontal"









  5.AlertDialog：//弹出提示框




  AlertDialog.Builder dialog =  new AlertDialog.Builder(MainActivity.this);




  dialog.setTitle




  dialog.setMessage




  dialog.setCancelable  //是否能通过BACK退出对话 FALSE为不允许




  //对话中按键监听事件




  dialog.setPositiveButton("OK",new DialogInterface.OnClickListener() {




                      @Override




                      public void onClick(DialogInterface dialog, int which) {




                          imageView.setImageResource(R.drawable.a1);




                      }




                  });




                  dialog.setNegativeButton("Cancel",new DialogInterface.OnClickListener() {




                      @Override




                      public void onClick(DialogInterface dialog, int which) {









                      }




                  });









  6.Loading框




  ProgressDialog.Builder dialog =  new ProgressDialog.Builder(MainActivity.this);




                  dialog.setTitle("this is Dialog");




                  dialog.setMessage("Loading...");




                  dialog.setCancelable(false); //在代码中设置好控制取消，调用dismiss()




   dialog.show();