2015/9/1

2015-09-01

2015/9/2问题集

AlertDialog

AlertDialog是Dialog的一个直接子类

一个AlertDialog可以有两个Button或者3个Button

可以对一个AlertDialog设置title、message。

不能直接通过AlertDialog的构造函数来生成一个AlertDialog

一般生成的时候都是通过它的的一个内部静态类AlertDialog.Builder来构造的。

AlertDialog的使用利用系统自带的进行设置

跟其他提示框一样要先创建成dialog，然后才可以show或者dismiss

package com.zsz.develop.alertdialogdemo;

    import android.app.AlertDialog;
    import android.content.DialogInterface;
    import android.content.Intent;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.Menu;
    import android.view.MenuItem;

    public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    send();
}

public void send()
{
// ....... 构造一个 AlertDialog
    AlertDialog.Builder builder = new AlertDialog.Builder(this)
            // 对话框标题
            .setTitle("简单对话框")
                    // 对话框图标
            .setIcon(R.mipmap.ic_launcher);
    // 对话框内容
    // .setMessage("对话框内容.");
// 添加一个按钮，并监听按钮事件 (积极的;确实的)
    builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            Intent intent = new Intent(MainActivity.this, ControlActivity.class);
            startActivity(intent);
        }
    });
// 添加一个按钮，并监听按钮事件 (消极的;否认的)
    builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            Intent intent = new Intent(MainActivity.this, ControlActivity.class);
            startActivity(intent);
        }
    });
// 添加一个按钮，并监听按钮事件 (中立的)
    builder.setNeutralButton("帮助", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            Intent intent = new Intent(MainActivity.this, ControlActivity.class);
            startActivity(intent);
        }
    });
// 列表
    CharSequence chars[] = {"hello", "wrold"};
// 列表项目对话框
    builder.setItems(chars, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            // 点击了第几列
            Log.i("info", String.valueOf(which));
            // ... 动作
            Intent intent = new Intent(MainActivity.this, ControlActivity.class);
            startActivity(intent);
        }
    });
// 单选按钮
    builder.setSingleChoiceItems(chars, 0, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            // 点击了第几列
            Log.i("info", String.valueOf(which));
            // ... 动作
            Intent intent = new Intent(MainActivity.this, ControlActivity.class);
            startActivity(intent);
        }
    });
    boolean m_boolean[] = {false, false};
// 多选按钮
    builder.setMultiChoiceItems(chars, m_boolean, new DialogInterface.OnMultiChoiceClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which, boolean isChecked) {
            // 获取点击事件，并进行记录
            Log.i("info", String.valueOf(which) + " " + String.valueOf(isChecked));
        }
        });
// 获取一个 View
// View root = this.getLayoutInflater().inflate(R.layout.activity_control, null);
// 可以设置 View
// builder.setView(root);
// 创建及显示
    builder.create().show();
// .......
}
}

CharSequence与String之间的区别

CharSequence与String都能用于定义字符串，但CharSequence的值是可读可写序列，而String的值是只读序列。

有message就没有item

还可以设置单选框多选框

单选框

.setSingleChoiceItems(new String[] {"选项1","选项2","选项3","选项4"}, 0,

多选框

.setMultiChoiceItems(new String[] {"选项1","选项2","选项3","选项4"}, null, null)

#

AlertDialog的使用自定义设置

package com.zsz.develop.alertdialogdemo;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class ControlActivity extends AppCompatActivity {
View root;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_control);
    findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            send();
        }
    });
}
public void send()
{
    // 获取一个 View
    root = this.getLayoutInflater().inflate(R.layout.activity_control, null);
    // .......
    AlertDialog.Builder builder = new AlertDialog.Builder(this)
            // 对话框标题
            .setTitle("简单对话框")
                    // 对话框图标
            .setIcon(R.mipmap.ic_launcher);
    // 对话框内容
    // .setMessage("对话框内容.");
    // 添加一个按钮，并监听按钮事件 (积极的;确实的)
    builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            // 获取结果
            EditText edit = (EditText) root.findViewById(R.id.editText);
            EditText edit2 = (EditText) root.findViewById(R.id.editText2);
            Log.i("info", edit.getText().toString());
            Log.i("info", edit2.getText().toString());
        }
    });
    // 添加一个按钮，并监听按钮事件 (消极的;否认的)
    builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            Intent intent = new Intent(ControlActivity.this, ControlActivity.class);
            startActivity(intent);
        }
    });
    // 可以设置 View
    builder.setView(root);
    // 创建及显示
    builder.create().show();
    // .......
}
}

布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.nljb.nljb.ControlActivity">


<LinearLayout
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_alignParentTop="true">
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="btn"
            android:id="@+id/btn"
            />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="用户名"
            android:id="@+id/textView" />
        <EditText
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:inputType="textPersonName"
            android:text="Name"
            android:ems="10"
            android:id="@+id/editText" />
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密    码"
            android:id="@+id/textView2" />
        <EditText
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:inputType="numberPassword"
            android:ems="10"
            android:id="@+id/editText2" />
    </LinearLayout>
</LinearLayout>
</RelativeLayout>

drawerlayoutandroid 抽屉效果的导航菜单实现

Spinner的使用

package com.zsz.develop.spinnerdemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

private static final String[] m={"A型","B型","O型","AB型","其他"};
private TextView view ;
private Spinner spinner;
private ArrayAdapter<String> adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    view = (TextView) findViewById(R.id.spinnerText);
    spinner = (Spinner) findViewById(R.id.Spinner01);
    //将可选内容与ArrayAdapter连接起来
    adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,m);

    //设置下拉列表的风格
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    //将adapter 添加到spinner中
    spinner.setAdapter(adapter);

    //添加事件Spinner事件监听
    spinner.setOnItemSelectedListener((AdapterView.OnItemSelectedListener) new SpinnerSelectedListener());

    //设置默认值
    spinner.setVisibility(View.VISIBLE);

}

//使用数组形式操作
class SpinnerSelectedListener implements AdapterView.OnItemSelectedListener {

    public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
                               long arg3) {
        view.setText("你的血型是："+m[arg2]);

//这是得到spinner里面的内容
//        String selectedValue = (String)spType.getSelectedItem();
    }

    public void onNothingSelected(AdapterView<?> arg0) {
    }
}
}

layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<TextView android:id="@+id/spinnerText"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"></TextView>
<Spinner android:id="@+id/Spinner01"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"></Spinner>
</LinearLayout>