The most scientific writing usage of the four dialog boxes of alertdialog in Android (example code)
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Android
First, let's look at the figure above:
The XML code is as follows, which is used to write buttons:
<?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:background="@drawable/background" xmlns:widget="http://schemas.android.com/apk/res-auto" android:orientation="vertical"> <Button android:id="@+id/button_1" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="简单的dialog" /> <Button android:id="@+id/button_2" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="列表的dialog" /> <Button android:id="@+id/button_3" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="单选的dialog" /> <Button android:id="@+id/button_4" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="多选的dialog" /> </LinearLayout>
The Java code is as follows to implement the logic:
import androidx.appcompat.app.ActionBar; import androidx.appcompat.app.AlertDialog; import androidx.appcompat.app.AppCompatActivity; import android.content.DialogInterface; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends AppCompatActivity{ int index; String [] item = {"Android","IOS","Spark","Hadoop","Web"}; boolean[] bools = {false,false,false}; // 设置boolean数组所有的选项设置默认没选 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ActionBar actionBar = getSupportActionBar(); if (actionBar != null) { actionBar.hide(); } Button button=(Button)findViewById(R.id.button_1); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setIcon(R.drawable.girl); builder.setTitle("标题栏"); builder.setMessage("对话框内容,可自行设置"); builder.setPositiveButton("确定",new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog,int which) { Toast.makeText(MainActivity.this,"点击了确定",Toast.LENGTH_SHORT).show(); } }); builder.setNegativeButton("取消",new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialogInterface,int i) { Toast.makeText(MainActivity.this,"点击了取消",Toast.LENGTH_SHORT).show(); } }); builder.setNeutralButton("好的","点击了“好的”",Toast.LENGTH_SHORT).show(); } }); AlertDialog alertDialog = builder.create(); alertDialog.show(); } }); Button button2=(Button)findViewById(R.id.button_2); button2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setTitle("请选择一个技术分支"); builder.setItems(item,"选择了"+item[which],Toast.LENGTH_SHORT).show(); } }); // 取消可以不添加 //builder.setNegativeButton("取消",null); AlertDialog alertDialog = builder.create(); alertDialog.show(); } }); Button button3=(Button)findViewById(R.id.button_3); button3.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setTitle("请选择技术分支:"); builder.setSingleChoiceItems(item,index,int which) { index = which; } }); builder.setPositiveButton("确定","选择了"+item[index],null); AlertDialog alertDialog = builder.create(); alertDialog.show(); } }); Button button4=(Button)findViewById(R.id.button_4); button4.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setTitle("请选择技术分支:"); builder.setMultiChoiceItems(item,bools,new DialogInterface.OnMultiChoiceClickListener() { @Override public void onClick(DialogInterface dialog,int which,boolean isChecked) { bools[which] = isChecked; } }); builder.setPositiveButton("确定",int which) { StringBuffer sb = new StringBuffer(); for (int i = 0; i < item.length; i++) { if (bools[i]) { sb.append(item[i] + " "); } } Toast.makeText(MainActivity.this,"选择了" + sb.toString(),null); AlertDialog alertDialog = builder.create(); alertDialog.show(); } }); } }
summary
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