这是我发送额外数据的方式
btn_category.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
WriteLog.d("ThangTB", "onclick image");
Intent i=new Intent(MainActivity.this,QuoteList.class);
i.putExtra("category", "ok");
MainActivity.this.startActivity(i);
}
});
并使用
接收数据Intent intent = getIntent();
//ambil data putextra variabel category dari intent
String category = intent.getStringExtra("category");
//if category sama dengan ok
if(category=="ok")
spinnerCategory.performClick();
单击按钮时保持力量关闭。 我试过How to use putExtra() and getExtra() for string data，但是当我点击按钮
时仍然强行关闭这里是QuoteList的完整代码
/**
* * / public class QuoteList扩展了AbstractContentActivity {
Spinner spinnerPage;
Spinner spinnerCategory;
ListView lv;
ImageButton btn_expand;
ImageButton btn_logo;
Button btn_next;
Button btn_pre;
TextView tv_empty;
QuoteAdapter adapter;
DataHeper dataHeper;
ArrayList<Quote> listData;
private ProgressDialog dialogLoading;
private boolean isSort = false;
private int iStart =0;
int total;
ArrayList<String> listSpinerPage;
ArrayList<String> listSpinerCategory;
private int currentPostion =0;
private boolean hasGetTotal = false;
private boolean firstStart = true;
/* (non-Javadoc)
* @see com.android.jokesapp.jokes2.activity.AbstractActivity#getViewLayoutId()
*/
@Override
protected int getViewLayoutId() {
// TODO Auto-generated method stub
return R.layout.full_quotes_index;
}
/* (non-Javadoc)
* @see com.android.jokesapp.jokes2.activity.AbstractContentActivity#initView()
*/
@Override
protected void initView() {
// TODO Auto-generated method stub
super.initView();
spinnerPage = (Spinner)findViewById(R.id.fqi_page_no);
spinnerCategory = (Spinner)findViewById(R.id.fqi_category);
lv = (ListView)findViewById(R.id.fqi_ListView);
btn_expand = (ImageButton)findViewById(R.id.fqi_expand_quotes_btn);
btn_logo = (ImageButton)findViewById(R.id.actionbar_logo_btn);
btn_next = (Button)findViewById(R.id.fqi_next_btn);
btn_pre = (Button)findViewById(R.id.fqi_previous_btn);
tv_empty = (TextView)findViewById(R.id.empty);
SplashActivity.displayBanner(this);
dataHeper = new DataHeper(getApplicationContext());
listData = new ArrayList<Quote>();
listSpinerPage = new ArrayList<String>();
listSpinerCategory = new ArrayList<String>();
Intent intent = getIntent();
//ambil data putextra variabel category dari intent
String category = intent.getStringExtra("category");
//if category sama dengan ok
if(category=="ok")
spinnerCategory.performClick();
//spinnercategory performclick
btn_expand.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (adapter.isExpand()) {
adapter.setExpand(false);
adapter.notifyDataSetChanged();
btn_expand.setImageResource(R.drawable.actionbar_ic_resize);
btn_expand.setAdjustViewBounds(true);
}else{
adapter.setExpand(true);
adapter.notifyDataSetChanged();
btn_expand.setImageResource(R.drawable.actionbar_ic_resize_pressed);
btn_expand.setAdjustViewBounds(true);
}
}
});
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View v, int pos,
long id) {
// TODO Auto-generated method stub
Intent i = new Intent(getApplicationContext(), QuoteView.class);
i.putExtra(Constants.Bundle_quote, listData.get(pos));
currentPostion = pos;
startActivity(i);
}
});
btn_logo.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
QuoteList.this.finish();
}
});
}
/* (non-Javadoc)
* @see com.android.jokesapp.jokes2.activity.AbstractActivity#onResume()
*/
@Override
protected void onResume() {
new GetData().execute();
super.onResume();
}
/**
* get data task
* @author ThangTB
*
*/
private class GetData extends AsyncTask<Object, Object, Object>{
public GetData() {
}
/* (non-Javadoc)
* @see android.os.AsyncTask#onPreExecute()
*/
@Override
protected void onPreExecute() {
super.onPreExecute();
dialogLoading = DialogLoading.Loading(activity,"Loading jokes...");
dialogLoading.show();
}
/* (non-Javadoc)
* @see android.os.AsyncTask#doInBackground(Params[])
*/
@Override
protected Object doInBackground(Object... params) {
// TODO Auto-generated method stub
if (!hasGetTotal) {
total = dataHeper.getTotalQuotesNoFilter();
if (total>0) {
if (total>=50) {
for (int i = 1; i <= total-50; i+=50) {
String s = (i)+" - "+ (i+49);
listSpinerPage.add(s);
}
String s1 = listSpinerPage.get(listSpinerPage.size()-1);
String s2 = s1.substring(s1.indexOf("-")+1);
int num =Integer.parseInt(s2.trim());
if ( num<total) {
listSpinerPage.add((num)+" - "+ total);
}
}else{
listSpinerPage.add(1+" - "+ total);
}
}
hasGetTotal = true;
}
return null;
}
/* (non-Javadoc)
* @see android.os.AsyncTask#onPostExecute(java.lang.Object)
*/
@Override
protected void onPostExecute(Object result) {
if (total>0) {
new GetQuoteData(iStart, null,"").execute();
if (firstStart) {
tv_empty.setVisibility(View.GONE);
//list
CustomArrayAdapter spinnerAdapter = new CustomArrayAdapter(getApplicationContext(),
R.layout.spinner_item_style,
listSpinerPage);
spinnerPage.setAdapter(spinnerAdapter);
spinnerPage.setOnItemSelectedListener(onItemSelectedListener);
//category
listSpinerCategory = dataHeper.getCategory();
CustomArrayAdapter catAdapter = new CustomArrayAdapter(getApplicationContext(),
R.layout.spinner_item_style,
listSpinerCategory);
spinnerCategory.setAdapter(catAdapter);
spinnerCategory.setOnItemSelectedListener(selectCategory);
}
}else{
tv_empty.setVisibility(View.VISIBLE);
dialogLoading.dismiss();
}
firstStart = false;
super.onPostExecute(result);
}
}
OnItemSelectedListener selectCategory =new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int pos,
long id) {
// TODO Auto-generated method stub
String category = listSpinerCategory.get(pos);
String sStart = listSpinerPage.get(pos);
iStart = Integer.parseInt(sStart.substring(0, sStart.indexOf("-")-1).trim());
new GetQuoteData(iStart, null, category).execute();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
};
OnItemSelectedListener onItemSelectedListener =new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int pos,
long id) {
// TODO Auto-generated method stub
String sStart = listSpinerPage.get(pos);
iStart = Integer.parseInt(sStart.substring(0, sStart.indexOf("-")-1).trim());
new GetQuoteData(iStart, null, "").execute();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
};
OnItemSelectedListener onSpinnerSortItemSelectedListener =new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int pos,
long id) {
// TODO Auto-generated method stub
String sStart;
if (!isSort) {
isSort =true;
return;
}else{
sStart = listSpinerPage.get(spinnerPage.getSelectedItemPosition());
iStart = Integer.parseInt(sStart.substring(0, sStart.indexOf("-")-1).trim());
new GetQuoteData(iStart, null, "").execute();
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
};
/**
* get data task
* @author ThangTB
*
*/
private class GetQuoteData extends AsyncTask<Object, Object, Object>{
private int start;
private String sort;
private String category = "";
public GetQuoteData(int start, String sort, String category) {
this.start = start;
this.sort = sort;
this.category = category;
}
/* (non-Javadoc)
* @see android.os.AsyncTask#onPreExecute()
*/
@Override
protected void onPreExecute() {
super.onPreExecute();
if (null == dialogLoading) {
dialogLoading = DialogLoading.Loading(activity,"Loading jokes...");
dialogLoading.show();
}else if (!dialogLoading.isShowing()) {
dialogLoading = DialogLoading.Loading(activity,"Loading jokes...");
dialogLoading.show();
}
}
/* (non-Javadoc)
* @see android.os.AsyncTask#doInBackground(Params[])
*/
@Override
protected Object doInBackground(Object... params) {
// TODO Auto-generated method stub
if (category.isEmpty()) listData = dataHeper.getQuoteByLimit(start, 50, sort);
else listData = dataHeper.getQuoteByCategory(category);
return null;
}
/* (non-Javadoc)
* @see android.os.AsyncTask#onPostExecute(java.lang.Object)
*/
@Override
protected void onPostExecute(Object result) {
adapter = new QuoteAdapter(getApplicationContext(), listData);
adapter.setOnClickCheckBoxListener(new OnClickCheckBoxListener() {
@Override
public void OnClick(View v, Quote item, int pos) {
// TODO Auto-generated method stub
WriteLog.d(QuoteList.this.getLocalClassName(), "click");
if (item.getIs_favourist()==0) {
dataHeper.AddFavourites(String.valueOf(item.getId()));
listData.get(pos).setIs_favourist(1);
}else{
dataHeper.DeleteFavourites(String.valueOf(item.getId()));
listData.get(pos).setIs_favourist(0);
}
adapter.setData(listData);
adapter.notifyDataSetChanged();
}
});
if (listData.size()==0) {
tv_empty.setVisibility(View.VISIBLE);
}else{
tv_empty.setVisibility(View.GONE);
}
lv.setAdapter(adapter);
lv.setSelection(currentPostion);
currentPostion =0;
if (dialogLoading.isShowing()) {
dialogLoading.dismiss();
}
super.onPostExecute(result);
}
}
}
答案 0 :(得分：0)
只需使用以下代码即可将数据读取为
Bundle extras = getIntent().getExtras();
if(extras == null) {
Toast.makeText(getApplicationContext(), "No Data Found...", Toast.LENGTH_LONG).show();
}
else{
String category = extras.getString("category");
if(category.equals("ok"))
{
Toast.makeText(getApplicationContext(), "category Value :"+category, Toast.LENGTH_LONG).show();
}
}
比较两个字符串还有一件事你应该使用.equals（）方法。 [==仅比较参考文献]
希望这能解决您的问题。