public class MainActivity extends AppCompatActivity {
private String [] names = new String [] {"Lion","Tiger","Monkey","Dog","Cat","Elephant"};
private int [] imageIds = new int[] {R.drawable.lion,
R.drawable.tiger,
R.drawable.monkey,
R.drawable.dog,
R.drawable.cat,
R.drawable.elephant};
// private listview listview;
HashMap<View, Boolean> view_select;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
view_select = new HashMap<>();
List<Map<String, Object>> listItems = new ArrayList<>();
for (int i = 0; i < names.length; i++)
{
Map<String, Object> listItem = new HashMap<>();
listItem.put("header", imageIds[i]);
listItem.put("personName", names[i]);
listItems.add(listItem);
}
//create a SimpleAdapter
SimpleAdapter simpleAdapter = new SimpleAdapter(this,
listItems,
R.layout.simple_item,
new String[]{"personName","header"},
new int[]{R.id.name, R.id.header});
ListView list = findViewById(R.id.mylist);
list.setAdapter(simpleAdapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener(){
public void onItemClick(AdapterView parent, View view,int position,long id){
Toast.makeText(MainActivity.this,names[position],Toast.LENGTH_LONG).show();
}
});
}<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/name"
android:layout_width="351dp"
android:layout_height="38dp"
android:layout_gravity="center_vertical"
android:textSize="15sp" />
<ImageView
android:id="@+id/header"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_gravity="end" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="wrap_content">
<ListView
android:id="@+id/mylist"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button bn=(Button)findViewById(R.id.clickme);
LayoutInflater inflater=MainActivity.this.getLayoutInflater();
View v= inflater.inflate(R.layout.alert,null,false);
Context context=MainActivity.this;
AlertDialog.Builder builder=new AlertDialog.Builder(context);
//创建AlterDialog对象
builder.setView(v);
//输入文本
builder.setCancelable(false);
final AlertDialog alertDialog=builder.create();
//创建对象
bn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
alertDialog.show();
}
});
v.findViewById(R.id.cancel).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(MainActivity.this,"cancle",Toast.LENGTH_LONG).show();
alertDialog.dismiss();
}
});
v.findViewById(R.id.signin).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(MainActivity.this,"Sign in",Toast.LENGTH_LONG).show();
alertDialog.dismiss();
}
});
}
}
[
public class MainActivity extends AppCompatActivity {
private TextView txt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txt = findViewById(R.id.txt);
}
public boolean onCreateOptionsMenu(Menu menu){
getMenuInflater().inflate(R.menu.menu_main, menu);
return super.onCreateOptionsMenu(menu);
}
public boolean onOptionsItemSelected(MenuItem mi){
if(mi.isCheckable()){
mi.setChecked(true);
}
switch (mi.getItemId()){
case R.id.font_10: txt.setTextSize(10*2); break;
case R.id.font_16: txt.setTextSize(16*2); break;
case R.id.font_20: txt.setTextSize(20*2); break;
case R.id.red_font: txt.setTextColor(Color.RED); break;
case R.id.black_font: txt.setTextColor(Color.BLACK); break;
case R.id.plain_item:
Toast.makeText(MainActivity.this,"单击普通菜单项",Toast.LENGTH_SHORT).show();
break;
}
return true;
}
}
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:title="字体大小"
>
<menu>
<!-- 定义一组单选菜单项-->
<group android:checkableBehavior="single">
<!--定义多个菜单项-->
<item
android:id="@+id/font_10"
android:title="font_10"/>
<item
android:id="@+id/font_16"
android:title="font_16"/>
<item
android:id="@+id/font_20"
android:title="font_20"/>
</group>
</menu>
</item>
<!--普通菜单项-->
<item android:id="@+id/plain_item"
android:title="普通菜单项">
</item>
<item android:title="字体颜色">
<menu>
<item
android:id="@+id/red_font"
android:title="红色"/>
<item
android:id="@+id/black_font"
android:title="黑色"/>
</menu>
</item>
</menu>
ActionMode.Callback callback = new ActionMode.Callback() {
@Override
public boolean onCreateActionMode(ActionMode actionMode, Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onPrepareActionMode(ActionMode actionMode, Menu menu) {
return false;
}
@Override
public boolean onActionItemClicked(ActionMode actionMode, MenuItem menuItem) {
actionMode.setTitle(selected_items + " selected");
return true;
}
@Override
public void onDestroyActionMode(ActionMode actionMode) {
}
[
