在每个项目上创建一个包含onClick侦听器的列表 [英] Create a list with onClick listener on each item
本文介绍了在每个项目上创建一个包含onClick侦听器的列表的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个 SQLite
db,我希望在ListView中看到所有元素。但我想让每一行都可以点击。这该怎么做?这是代码:
然后..另一个问题..我有一个活动,我可以通过选项菜单启动它,它添加或删除数据库中的数据..我想在我回来时自动更新列表这个活动..如何更改代码?。
I have a SQLite
db and I want to see in a ListView all the elements. But I want to make every row clickable. How to do this? Here is the code:
Then.. another question.. I have an activity that I can launched by the options menu and it add or remove data from the db.. I want to autoupdate the list when i come back to this activity.. How can I change the code?.
public class WorkflowChoice extends Activity
{
private static final int INIT_JADE_PROFILE = 0;
private static final int MANAGE_DATABASE = 1;
private static final int MODIFY_FILES = 2;
private static final int CHANGE_THEME = 3;
private static final int SHOW_OUTPUT_WORKFLOW = 4;
private LinearLayout properties_container;
private MyDatabase db;
TextView wfsTv;
ListView wfsLv;
private Cursor c;
public MyDatabase getDb()
{
return db;
}
@Override protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.choice);
properties_container = (LinearLayout ) findViewById(R.id.properties_container);
String host = (String) InitJadeProperties.retrieve(this, getString(R.string.main_container_host), getString(R.string.default_host));
String port = (String) InitJadeProperties.retrieve(this, getString(R.string.main_container_port), getString(R.string.default_port));
wfsTv=(TextView)findViewById(R.id.wfsTv);
ListView wfsLv = (ListView)findViewById(R.id.wfsLv);
db=new MyDatabase(getApplicationContext());
db.open();
//apriamo il db
if(db.fetchWfs().getCount()==0)
{
//inserimento dati, solo se il db è vuoto
db.insertWf("WF1", "class1");
db.insertWf("WF2", "class2");
db.insertWf("WF3", "class3");
db.insertWf("WF4", "class4");
db.insertWf("WF5", "class5");
}
c=db.fetchWfs();
// query
startManagingCursor(c);
SimpleCursorAdapter adapter=new SimpleCursorAdapter( //semplice adapter per i cursor this, R.layout.wfs,
//il layout di ogni riga/prodotto c,new String[]
{
MyDatabase.WfMetaData.ID,MyDatabase.WfMetaData.WF_NAME_KEY,MyDatabase.WfMetaData.WF_CLASS_KEY
}
,//questi colonne
new int[]{R.id.IDTv,R.id.nameTv,R.id.classTv } );
//in queste views
wfsLv.setAdapter(adapter);
//la listview ha questo adapter //qui vediamo invece come reperire i dati e usarli, in questo caso li stampiamo in una textview
int nameCol=c.getColumnIndex(MyDatabase.WfMetaData.WF_NAME_KEY);
//indici delle colonne
int classCol=c.getColumnIndex(MyDatabase.WfMetaData.WF_CLASS_KEY);
if(c.moveToFirst())
{
//se va alla prima entry, il cursore non è vuoto do
{
wfsTv.append("Wf Name:"+c.getString(nameCol)+", Class:"+c.getString(classCol)+"\n");
//estrazione dei dati dalla entry del cursor
}
while (c.moveToNext());
//iteriamo al prossimo elemento
}
db.close();
getWindow().setFormat(PixelFormat.RGBA_8888);
//visto che usiamo i gradient, usiamo questo trick (vedi snippet forum) getWindow().addFlags(WindowManager.LayoutParams.FLAG_DITHER);
//wfsLv.setBackgroundDrawable(new GradientDrawable(GradientDrawable.Orientation.BOTTOM_TOP, new int[]
{
Color.RED,Color.parseColor("#f2bf26")
}
));
//wfsTv.setBackgroundDrawable(new GradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, new int[]
{
Color.RED,Color.parseColor("#f2bf26")
}
));
//definizione ed uso di gradient in modo programmatico //animazioni in modo programmatico (vedi snippet forum) Animation a1 = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_PARENT, 1.0f, Animation.RELATIVE_TO_SELF, 0.0f);
a1.setDuration(1000);
a1.setInterpolator(AnimationUtils.loadInterpolator(this, android.R.anim.decelerate_interpolator));
wfsLv.startAnimation(a1);
//entra da sotto Animation a2 = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_PARENT, -1.0f, Animation.RELATIVE_TO_SELF, 0.0f);
a2.setDuration(1000);
a2.setInterpolator(AnimationUtils.loadInterpolator(this, android.R.anim.decelerate_interpolator));
wfsTv.startAnimation(a2);
//entra da sopra wfsLv.setClickable(true);
//e affidiamo la gestione del tap/click ad un apposito listener, che ci permetterà di agire sull’elemento cliccato e ricaricare la nostra lista wfsLv.setOnItemClickListener (new AdapterView.OnItemClickListener()
{
public void onItemClick(AdapterView<
?>
parent, View v, int position, long id)
{
TextView txtId = (TextView) v.findViewById(R.id.wfsTv);
c.requery();
}
}
);
/*wfsTv.setOnClickListener(new View.OnClickListener()
{
@Override public void onClick(View v)
{
CharSequence text = "Workflow scelto!";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(getApplicationContext(), text, duration);
toast.show();
}
}
);
*/ TextView masterTv = (TextView)findViewById(R.id.masterTv);
masterTv.setText("Master");
masterTv.setOnClickListener(new View.OnClickListener()
{
@Override public void onClick(View v)
{
startSubActivity();
}
}
);
}
private void startSubActivity()
{
Intent intent = new Intent(this, ConfigChoice.class);
startActivity(intent);
}
}
编辑
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.choice);
properties_container = (LinearLayout ) findViewById(R.id.properties_container);
String host = (String) InitJadeProperties.retrieve(this, getString(R.string.main_container_host), getString(R.string.default_host));
String port = (String) InitJadeProperties.retrieve(this, getString(R.string.main_container_port), getString(R.string.default_port));
wfsTv=(TextView)findViewById(R.id.wfsTv);
ListView wfsLv = (ListView)findViewById(R.id.wfsLv);
db=new MyDatabase(getApplicationContext());
db.open(); //apriamo il db
if(db.fetchWfs().getCount()==0){//inserimento dati, solo se il db è vuoto
db.insertWf("WF1", "class1");
db.insertWf("WF2", "class2");
db.insertWf("WF3", "class3");
db.insertWf("WF4", "class4");
db.insertWf("WF5", "class5");
}
c=db.fetchWfs(); // query
startManagingCursor(c);
SimpleCursorAdapter adapter=new SimpleCursorAdapter( //semplice adapter per i cursor
this,
R.layout.wfs, //il layout di ogni riga/prodotto
c,
new String[]{MyDatabase.WfMetaData.ID,MyDatabase.WfMetaData.WF_NAME_KEY,MyDatabase.WfMetaData.WF_CLASS_KEY},//questi colonne
new int[]{R.id.IDTv,R.id.nameTv,R.id.classTv});//in queste views
wfsLv.setAdapter(adapter); //la listview ha questo adapter
adapter.notifyDataSetChanged();
//qui vediamo invece come reperire i dati e usarli, in questo caso li stampiamo in una textview
int nameCol=c.getColumnIndex(MyDatabase.WfMetaData.WF_NAME_KEY); //indici delle colonne
int classCol=c.getColumnIndex(MyDatabase.WfMetaData.WF_CLASS_KEY);
if(c.moveToFirst()){ //se va alla prima entry, il cursore non è vuoto
do {
wfsTv.append("Wf Name:"+c.getString(nameCol)+", Class:"+c.getString(classCol)+"\n"); //estrazione dei dati dalla entry del cursor
} while (c.moveToNext());//iteriamo al prossimo elemento
}
db.close();
getWindow().setFormat(PixelFormat.RGBA_8888); //visto che usiamo i gradient, usiamo questo trick (vedi snippet forum)
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DITHER);
//wfsLv.setBackgroundDrawable(new GradientDrawable(GradientDrawable.Orientation.BOTTOM_TOP, new int[]{Color.RED,Color.parseColor("#f2bf26")}));
//wfsTv.setBackgroundDrawable(new GradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, new int[]{Color.RED,Color.parseColor("#f2bf26")}));
//definizione ed uso di gradient in modo programmatico
//animazioni in modo programmatico (vedi snippet forum)
Animation a1 = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_PARENT, 1.0f, Animation.RELATIVE_TO_SELF, 0.0f);
a1.setDuration(1000);
a1.setInterpolator(AnimationUtils.loadInterpolator(this, android.R.anim.decelerate_interpolator));
wfsLv.startAnimation(a1);
//entra da sotto
Animation a2 = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_PARENT, -1.0f, Animation.RELATIVE_TO_SELF, 0.0f);
a2.setDuration(1000);
a2.setInterpolator(AnimationUtils.loadInterpolator(this, android.R.anim.decelerate_interpolator));
wfsTv.startAnimation(a2);
//entra da sopra
wfsLv.setClickable(true);
//e affidiamo la gestione del tap/click ad un apposito listener, che ci permetterà di agire sull’elemento cliccato e ricaricare la nostra lista
wfsLv.setOnItemClickListener
(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent,
View v, int position, long id) {
//TextView txtId = (TextView)v.findViewById(R.id.wfsTv);
CharSequence text = "Workflow scelto!";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(getApplicationContext(), text, duration);
toast.show();
c.requery();
}
});
推荐答案
listview.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
//---> arg2 <-- will give you row number
// your code goes here
}
});
并更改数据
adapter.notifyDataSetChanged();
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