问题
<ScrollView
android:id="@+id/ScrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true" >
<LinearLayout
android:id="@+id/MainParent"
android:layout_width="wrap_content"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_marginLeft="20sp"
android:layout_marginRight="20sp"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="80sp"
android:text="Sim Card Master"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="@color/pumpkinorange"
android:textSize="17sp" />
<TextView
android:id="@+id/simno"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5sp"
android:text="Sim No"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@color/darkblue"
android:textSize="14sp" />
<EditText
android:id="@+id/simName"
android:layout_width="275dp"
android:layout_height="wrap_content"
android:selectAllOnFocus="true" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/TextView01"
android:layout_width="145dp"
android:layout_height="wrap_content"
android:text="Service Provider"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@color/darkblue"
android:textSize="14sp" />
<Spinner
android:id="@+id/spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:entries="@array/service_arrays"
android:prompt="@string/serviceprovid" />
<TextView
android:id="@+id/TextView02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="100sp"
android:layout_marginTop="5dp"
android:text="Unit Master"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="@color/pumpkinorange"
android:textSize="17sp" />
<TextView
android:id="@+id/TextView03"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5sp"
android:text="Unit No"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@color/darkblue"
android:textSize="14sp" />
<EditText
android:id="@+id/unitNo"
android:layout_width="275dp"
android:layout_height="wrap_content"
android:ems="10"
android:selectAllOnFocus="true" />
<TextView
android:id="@+id/TextView04"
android:layout_width="145dp"
android:layout_height="wrap_content"
android:text="IMEI No"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@color/darkblue"
android:textSize="14sp" />
<EditText
android:id="@+id/imeiNo"
android:layout_width="275dp"
android:layout_height="wrap_content"
android:ems="10"
android:selectAllOnFocus="true"/>
<TextView
android:id="@+id/vehicleNo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="80sp"
android:layout_marginTop="5dp"
android:gravity="center"
android:text="Vehicle Master"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="@color/pumpkinorange"
android:textSize="17sp" />
<TextView
android:id="@+id/TextView06"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:text="Vehicle No"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@color/darkblue"
android:textSize="14sp" />
<EditText
android:id="@+id/vehicleNo"
android:layout_width="275dp"
android:layout_height="wrap_content"
android:ems="10"
android:selectAllOnFocus="true"/>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="34dp"
android:layout_gravity="center"
android:text="Save"
android:textSize="15sp"
android:textStyle="italic"
android:typeface="normal" />
<Button
android:id="@+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:text="Reset"
android:textSize="15sp"
android:textStyle="italic"
android:typeface="normal" />
</LinearLayout>
</LinearLayout>
</ScrollView>
In this xml layout has four text fields and two buttons. while click on the reset button all the four textfields get cleared. How to define code for this in main activity.please Show explain me with code.
回答1:
In your MainActivity,
In your onCreate do this
Button reset = (Button)findViewById(R.id.reset);
Similarly Find your all textview here.
then,
reset.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
textview1.settext("");
textview2.settext("");
......
textview8.settext("");
}
});
回答2:
This is easier. I have a reset button and I reuse this code across different pages all I do is just change the mActivityABC basically calling the same page again as if you had clicked a next button it reloads and all EditText are clear. No arrays no setting of boxes nada!!
reset.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (v==reset) {
startActivity(new Intent(myActivityABC.this, myActivityABC.class));
}
}
});
回答3:
btn.setOnClickListener(new OnClickListener(){
@public void onClick(View view)
{
txt1.setText("");
txt2.setText("");
...
txtN.setText("");
}
});
Also you can use array for your views.
回答4:
// Onclicklistener on clear button.
btnclear.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
etjobname.setText("");
etcategor.setText("");
etname.setText("");
etaddress.setText("");
}
});
回答5:
reset.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
textview1.settext("");
textview2.settext("");
......
textview8.settext("");
}
});
In this code please put caps T then it will work ...thanks i have used and tested.
来源：https://stackoverflow.com/questions/18331233/how-to-define-a-reset-button-to-clear-all-text-field-at-one-click