我有一个活动,它使用 for 循环从共享首选项以编程方式进行布局。文本视图和按钮包含在线性布局中。用户可以输入任意数量的视图。现在,该按钮将是一个删除按钮。按下时,我想删除包含按钮和其他文本视图的线性布局。我该怎么做呢?
这是我的代码:
package com.dirkjan.myschools;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.graphics.Typeface;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends Activity {
LinearLayout subjectLeft, subjectRight;
Button addSubj;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
subjectLeft = (LinearLayout) findViewById(R.id.llSubjectLeft);
subjectRight = (LinearLayout) findViewById(R.id.llSubjectRight);
//Load the saved subjects
SharedPreferences getSubjects = getSharedPreferences("SubjectInfo_Prefs", MODE_PRIVATE);
SharedPreferences.Editor editor = getSubjects.edit();
int subjectCount = getSubjects.getInt("count", 0);
if (subjectCount > 0 ){
for (int i = 1; i <= subjectCount; i++){
//Set the linear layout for each subject
LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams llParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
float scale = getResources().getDisplayMetrics().density;
//SET BOTTOM MARGIN
float margin = 5; //RESIZE MARGIN HERE!
int margs = (int) (margin * scale + 0.5f);
//SET PADDING IN DP
float padding = 5; //RESIZE PADDING HERE!
int pads = (int) (padding * scale +0.5f);
llParams.setMargins(0,0,0,margs);
//SETTING THE LINEARLAYOUT PARAMS
ll.setLayoutParams(llParams);
ll.setPadding(pads, pads, pads, pads);
//SETTING THE BACKGROUND COLOR OF THE LINEAR LAYOUT
String chosenColor = getSubjects.getString("chosenColor" + i, "BLUE");
if (chosenColor.equals("Green")){
ll.setBackgroundResource(R.color.HoloGreen);
}else if (chosenColor.equals("Blue")){
ll.setBackgroundResource(R.color.HoloBlue);
}else if (chosenColor.equals("Gray")){
ll.setBackgroundResource(R.color.HoloGray);
}else if (chosenColor.equals("Orange")){
ll.setBackgroundResource(R.color.HoloOrange);
}else {
ll.setBackgroundResource(R.color.HoloYellow);
}
//ADDING THE LAYOUT TO THE APPROPRIATE CONTAINER (LEFT OR RIGHT)
if (i % 2 == 1){
subjectLeft.addView(ll);
} else {
subjectRight.addView(ll);
}
//SETTING THE SUBJECT NAME TEXTVIEW
TextView SubjectName = new TextView(this);
SubjectName.setText(getSubjects.getString("subjectName" + i, "Error"));
SubjectName.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
SubjectName.setTextSize(22);
SubjectName.setTypeface(Typeface.DEFAULT_BOLD);
//SETTING THE SUBJECT NUMB TEXT VIEW
TextView SubjectNumber = new TextView(this);
SubjectNumber.setText(getSubjects.getString("subjectNumb" + i, "Error"));
SubjectNumber.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
SubjectNumber.setTextSize(16);
//Creating the divider line
ImageView divider = new ImageView(this);
LinearLayout.LayoutParams dividerParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 2);
divider.setLayoutParams(dividerParams);
divider.setBackgroundResource(R.color.Black);
//Add Views into the Layout
ll.addView(SubjectNumber);
ll.addView(SubjectName);
ll.addView(divider);
}
}
addSubj = (Button) findViewById(R.id.buttonPlusSubject);
addSubj.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent toAddSubj = new Intent(MainActivity.this,
AddSubjectActivity.class);
startActivity(toAddSubj);
finish();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
请注意,没有为每个布局分配 id。如果有代码来识别按钮的父级的父级,这将有所帮助(该按钮处于相对布局中,该布局处于线性布局中,必须通过单击按钮来删除线性布局。