TEXTVIEW Click在android中不起作用
我希望用户在Textview Click上执行一些活动,但我的程序中没有正确调用该部分。请参阅XML文件、Java程序以及clickable event的特定功能 XML文件:TEXTVIEW Click在android中不起作用,android,onclick,textview,Android,Onclick,Textview,我希望用户在Textview Click上执行一些活动,但我的程序中没有正确调用该部分。请参阅XML文件、Java程序以及clickable event的特定功能 XML文件: 02-25 11:34:50.965: E/AndroidRuntime(6907): Uncaught handler: thread main exiting due to uncaught exception 02-25 11:34:50.980: E/AndroidRuntime(6907): java.lang
02-25 11:34:50.965: E/AndroidRuntime(6907): Uncaught handler: thread main exiting due to uncaught exception
02-25 11:34:50.980: E/AndroidRuntime(6907): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.jd.multileveltreelistview/com.jd.multileveltreelistview.MultilevelTreeListView}: java.lang.NullPointerException
02-25 11:34:50.980: E/AndroidRuntime(6907): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
02-25 11:34:50.980: E/AndroidRuntime(6907): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
02-25 11:34:50.980: E/AndroidRuntime(6907): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
02-25 11:34:50.980: E/AndroidRuntime(6907): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
02-25 11:34:50.980: E/AndroidRuntime(6907): at android.os.Handler.dispatchMessage(Handler.java:99)
02-25 11:34:50.980: E/AndroidRuntime(6907): at android.os.Looper.loop(Looper.java:123)
02-25 11:34:50.980: E/AndroidRuntime(6907): at android.app.ActivityThread.main(ActivityThread.java:4363)
02-25 11:34:50.980: E/AndroidRuntime(6907): at java.lang.reflect.Method.invokeNative(Native Method)
02-25 11:34:50.980: E/AndroidRuntime(6907): at java.lang.reflect.Method.invoke(Method.java:521)
02-25 11:34:50.980: E/AndroidRuntime(6907): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:862)
02-25 11:34:50.980: E/AndroidRuntime(6907): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
02-25 11:34:50.980: E/AndroidRuntime(6907): at dalvik.system.NativeStart.main(Native Method)
02-25 11:34:50.980: E/AndroidRuntime(6907): Caused by: java.lang.NullPointerException
02-25 11:34:50.980: E/AndroidRuntime(6907): at com.jd.multileveltreelistview.MultilevelTreeListView.onCreate(MultilevelTreeListView.java:29)
02-25 11:34:50.980: E/AndroidRuntime(6907): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-25 11:34:50.980: E/AndroidRuntime(6907): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
02-25 11:34:50.980: E/AndroidRuntime(6907): ... 11 more
我希望用户也点击文本视图,这样我就可以做一些功能。但是程序中的下面模块没有被调用。包含上述代码的Java程序,下面的程序应该调用CellTextClick,但它没有被调用
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="40dp"
android:background="#ffffff"
android:orientation="horizontal"
android:gravity="center"
android:id="@+id/row">
<HorizontalScrollView
android:id="@+id/scrollview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true"
android:scrollbars="none">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_marginLeft="0dp"
android:textSize="10dp"
android:textColor="#ffffff"
android:id="@+id/row_cell_text_dummy_multilevel"
android:singleLine="false" />
<Button
android:layout_width="30dp"
android:layout_height="30dp"
android:id="@+id/row_cell_btn_multilevel"
android:onClick="CellButtonClick"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"/>
<TextView
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:layout_marginLeft="7dp"
android:textSize="10dp"
android:clickable="true"
android:onClick="CellTextClick"
android:textColor="#000000"
android:layout_weight="4"
android:singleLine="false"
android:gravity="center|left"/>
</LinearLayout>
</HorizontalScrollView>
</LinearLayout>
package com.jd.multi-leveltreelistview;
导入java.util.ArrayList;
导入android.app.Activity;
导入android.os.Bundle;
导入android.util.Log;
导入android.view.view;
导入android.widget.Button;
导入android.widget.ListView;
导入android.widget.TextView;
导入android.widget.Toast;
公共类多级TreeListView扩展活动
{
列表适配器;
ListView主列表;
Arrayli贸易公司;
公共静态int-totcnt=0;
@凌驾
创建时受保护的void(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.treelist);
mainList=(ListView)findViewById(R.id.currentpending_列表);
mainList.setDividerHeight(4);
arrTrades=newarraylist();
}
@凌驾
受保护的void onResume()
{
如果(arrTrades.size()==0){
大众主义者();
}
super.onResume();
}
公共实体getEntity(int级别,int haschild){
实体E=新实体();
E.Name=“Level”+级别;
E.Name=“S.Viswanathan”+totcnt+“\n”;
E.Name=E.Name+“角色:组长”+“\n”;
E.Name=E.Name+“邮件:s。vishy@tcscom“+”\n”;
E.Name=E.Name+“电话:9600421518”;
totcnt=totcnt+1;
E.isOpened=false;
E.水平=水平;
E.HasChild=HasChild;
返回E;
}
公共无效公共列表()
{
尝试
{
对于(int i=0;i请尝试以下操作
package com.jd.multileveltreelistview;
import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class MultilevelTreeListView extends Activity
{
ListAdapter adapter;
ListView mainList;
ArrayList<Entity>arrTrades;
public static int totcnt = 0;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.treelist);
mainList=(ListView)findViewById(R.id.currentpending_list);
mainList.setDividerHeight(4);
arrTrades=new ArrayList<Entity>();
}
@Override
protected void onResume()
{
if(arrTrades.size()==0){
populateList();
}
super.onResume();
}
public Entity getEntity(int level,int haschild){
Entity E=new Entity();
E.Name="Level "+level;
E.Name= " S.Viswanathan " + totcnt + "\n";
E.Name = E.Name + "Role: Group Leader " + "\n";
E.Name = E.Name + "Mail: s.vishy@tcscom " + "\n";
E.Name = E.Name + "Phone: 9600421518";
totcnt = totcnt + 1;
E.isOpened=false;
E.level=level;
E.HasChild=haschild;
return E;
}
public void populateList()
{
try
{
for(int i=0;i<1;i++){
arrTrades.add(getEntity(0, 1));
}
adapter=new ListAdapter(MultilevelTreeListView.this, R.id.row_cell_text_multilevel, arrTrades);
mainList.setAdapter(adapter);
}
catch (Exception e)
{
Log.d(" populateList Exception",""+e.getMessage());
}
}
public void CellTextClick(View v)
{
Toast.makeText(getApplicationContext(), "Answer As of Now : " , Toast.LENGTH_SHORT).show();
}
public void CellButtonClick(View v){
try{
Toast.makeText(getApplicationContext(), "Button Clicked : " , Toast.LENGTH_SHORT).show();
Button b=(Button)v;
int index;
index=(Integer) b.getTag();
if(b.getText().toString().equals("+")){
b.setText("-");
Entity temp[]=new Entity[5];
int PLevel=arrTrades.get(index).level+1;
for(int i=0;i<5;i++){
temp[i]=getEntity(PLevel, 1);
}
arrTrades.get(index).isOpened=true;
if(temp!=null){
int addindex=index+1;
for(int i=0;i<temp.length;i++){
arrTrades.add(addindex, temp[i]);
addindex++;
}
}
temp=null;
}
else{
b.setText("+");
arrTrades.get(index).isOpened=false;
int removeindex=index+1;
for(int i=0;i<5;i++){
if(arrTrades.get(removeindex).isOpened){
removeChilds(removeindex);
}
arrTrades.remove(removeindex);
}
}
adapter.notifyDataSetChanged();
}
catch(Exception e){
adapter.notifyDataSetChanged();
Log.d("Error=", ""+e.getMessage());
}
}
public void removeChilds(int index){
try {
int removeindex=index+1;
for(int i=0;i<5;i++){
if(arrTrades.get(removeindex).isOpened){
removeChilds(removeindex);
}
arrTrades.remove(removeindex);
}
} catch (Exception e) {
// TODO: handle exception
Log.d("Errro=", ""+e.getMessage());
}
}
}
试试这个
TextView tv1 = (TextView) findViewById(R.id.tv1);
tv1.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
switch(v.getId()){
case R.id.tv1:
Toast.makeText(getApplicationContext(), "Answer As of Now : " , Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
});
尝试为textview提供id,然后重试
或
试试这个:
TextView textview = (TextView) findViewById(R.id.yourid);
textview.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
}
});
为您的文本视图提供id
XML:-
希望它能起作用
最新答复:--
写这个,
TextView tv1 = (TextView) findViewById(R.id.txt);
tv1.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
switch(v.getId()){
case R.id.txt:
Toast.makeText(getApplicationContext(), "Answer As of Now : " , Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
});
而不是这个
TextView tv1 = (TextView) findViewById(R.id.row_cell_text_dummy_multilevel);
由于您已将按钮id
提供给文本视图
,因此出现空指针异常…尝试一下
TextView textview = (TextView) findViewById(R.id.row_cell_text_multilevel);
将id添加到文本视图
Textview tv;
tv=(TextView)findViewById(R.id.row_cell_text_dummy_multilevel);
tv.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
toast();
}
private void toast() {
// TODO Auto-generated method stub
Log.i("click", "sucss");
}
});
文本视图的click listener在哪里?将您的侦听器设置为java,而不是在xml
file@SPSumit:android:onClick=“CellTextClick”也为TextView工作。指示第29行@MultilevelTreeListView
TextView.setOnClickListener(新视图。OnClickListener(){不使用此选项….TextView TextView=(TextView)findViewById(R.id.row\u cell\u text\u multively);TextView.setOnClickListener(new View.OnClickListener(){@Override public void onClick(视图arg0){//TODO自动生成的方法存根Toast.makeText(getApplicationContext(),“截至现在的答案:”,Toast.LENGTH_SHORT.show();});必须解决此问题。请确保TextView的id正确。您将遇到空指针异常…是否已在xml中为TextView创建id?同时删除android:onClick=“CellTextClick”从xml.pass你的代码给我..这样我就可以解决这个问题。把你的代码寄到sumit。sptechnolab@gmail.comnot正在工作,请再次参阅帖子以了解错误。我现在更新了。亲爱的,在xmlgaved中为文本视图提供id。为文本视图提供(R.id.row\u cell\u text\u dummy\u多级)id
TextView tv1 = (TextView) findViewById(R.id.txt);
tv1.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
switch(v.getId()){
case R.id.txt:
Toast.makeText(getApplicationContext(), "Answer As of Now : " , Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
});
TextView tv1 = (TextView) findViewById(R.id.row_cell_text_dummy_multilevel);
TextView textview = (TextView) findViewById(R.id.row_cell_text_multilevel);
Textview tv;
tv=(TextView)findViewById(R.id.row_cell_text_dummy_multilevel);
tv.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
toast();
}
private void toast() {
// TODO Auto-generated method stub
Log.i("click", "sucss");
}
});
<TextView
android:id="@+id/textview01"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:layout_marginLeft="7dp"
android:textSize="10dp"
android:clickable="true"
android:onClick="CellTextClick"
android:textColor="#000000"
android:layout_weight="4"
android:singleLine="false"
android:gravity="center|left"/>
TextView textview = (TextView) findViewById(R.id.textview01);
textview.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
System.out.println("Text clicked");
}
});