6 5周作业
package itcast.cn; import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.app.Activity; public class Main2Activity extends Activity { protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main2); } public void onBackPressed(){ AlertDialog dialog; AlertDialog.Builder builder=new AlertDialog.Builder(this) .setTitle("普通对话框") .setIcon(R.drawable.ic_launcher_background) .setMessage("是否确定退出") .setPositiveButton("确定", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); Main2Activity.this.finish();} }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); dialog=builder.create(); dialog.show(); } }
package com.example.chap6; import android.os.Bundle; import android.app.Activity; import android.app.AlertDialog; import android.app.AlertDialog.Builder; import android.content.DialogInterface; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast; public class MainActivity extends Activity implements OnClickListener { private int num0=0; private int num1[]={0,1}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.bt).setOnClickListener(this); } @Override public void onClick(View v) { // TODO Auto-generated method stub AlertDialog.Builder builder=new AlertDialog.Builder(this) .setTitle("性别") .setSingleChoiceItems(new String[]{"男","女"}, -1, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub num0=which; } }) .setPositiveButton("是",new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub if(num0==0){ Toast.makeText(MainActivity.this, "您选择的是男", Toast.LENGTH_LONG).show(); }else{ Toast.makeText(MainActivity.this, "您选择的是女", Toast.LENGTH_SHORT).show(); } dialog.dismiss(); } }) .setNegativeButton("否", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub dialog.dismiss(); } }); AlertDialog dialog=builder.create(); dialog.show();
}
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:background="#15E61E"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:text="1.TextView显示的文本信息" android:gravity="center" android:textSize="20sp" android:textColor="#FF0000"/> <Button android:layout_width="370dp" android:layout_height="wrap_content" android:layout_gravity="center" android:text="2.按钮" android:textSize="20sp" android:textColor="#FF0000"/> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:text="3.编辑框:请输入信息" android:textSize="20sp" android:textColor="#FF0000"/> <RadioGroup android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <RadioButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="男" android:textSize="20sp" android:textColor="#FF0000" /> <RadioButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="女" android:textSize="20sp" android:textColor="#FF0000"/> </RadioGroup> <RadioGroup android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <CheckBox android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="电脑" android:textSize="20sp" android:textColor="#FF0000"/> <CheckBox android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="手机" android:textSize="20sp" android:textColor="#FF0000"/> </RadioGroup> </LinearLayout>
package com.example.myapplication; import androidx.appcompat.app.AlertDialog; import androidx.appcompat.app.AppCompatActivity; import android.content.DialogInterface; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; ////implements View.OnClickListener public class MainActivity extends AppCompatActivity { private ListView mListView; private String[] titles = {"桌子", "苹果", "蛋糕", "线衣", "猕猴桃", "围巾"}; private String[] prices = {"1800元", "10/kg", "300元", "350元", "10/kg", "280元"}; private int[] icons = {R.drawable.table, R.drawable.apple, R.drawable.cake, R.drawable.wireclothes, R.drawable.kiwifruit, R.drawable.scarf}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.text64); mListView = (ListView) findViewById(R.id.lv_1); //MyBaseAdapter mAdapter = new MyBaseAdapter(); mListView.setAdapter(new MyBaseAdapter()); } class MyBaseAdapter extends BaseAdapter { @Override public int getCount() { return titles.length; } @Override public Object getItem(int position) { return titles[position]; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { View view = View.inflate(MainActivity.this, R.layout.text64_item, null); TextView title = view.findViewById(R.id.tv_list); TextView price = view.findViewById(R.id.tv_price); ImageView iv = view.findViewById(R.id.image); title.setText(titles[position]); price.setText(prices[position]); iv.setImageResource(icons[position]); return view; } } @Override public void onBackPressed(){ AlertDialog dialog; AlertDialog.Builder builder=new AlertDialog.Builder(this) .setTitle("普通对话框") .setIcon(R.mipmap.ic_launcher) .setMessage("是否退出应用:") .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int i) { dialog.dismiss(); MainActivity.this.finish(); } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int i) { dialog.dismiss(); } }); dialog=builder.create(); dialog.show(); } }