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item

按下state_pressed = "true"

點(diǎn)擊事件外部類的寫法

目錄結(jié)構(gòu)

<shape?xmlns:android="http://schemas.android.com/apk/res/android">
????<!--圓角-->
????<corners?android:radius="5dp"?/>
????<!--填充色-->
????<solid
????????android:color="@color/white"?/>
????<!--漸變-->
????<gradient?
????????android:startColor="@color/white"
????????android:endColor="@color/red"?/>
????<!--邊-->
????<stroke?
????????android:width="1dp"
????????android:color="@color/black"/>
</shape>

主題是黑色且沒(méi)有標(biāo)題欄（Manifest里）

<activity
????android:theme="@android:style/Theme.Black.NoTitleBar">

編輯文本框里的內(nèi)容在右邊

<EditText
????android:gravity="right|bottom"?/>

簽名填寫

簽名的意義

目錄圖解

onActivityResult(int RequestCode,int Result, Intent date)方法的三個(gè)參數(shù)

Intent跳轉(zhuǎn)頁(yè)面1

Activity的生命周期的幾種方法。

Activity的四種狀態(tài)。

當(dāng)Activity在最上層且獲得焦點(diǎn)則是活動(dòng)狀態(tài)。

當(dāng)Activity失去焦點(diǎn)，但用戶可見是暫停狀態(tài)。（如：在Ativity上有一個(gè)半透明的Activity.）

當(dāng)Activity完全被覆蓋，但所有狀態(tài)和成員信息是停止?fàn)顟B(tài)。

當(dāng)Activity完全停止，就是非活動(dòng)狀態(tài)。

Android-App簽名打包

簽名的意義

activity生命周期

hint 是提示信息

Intent兩種跳轉(zhuǎn)方式代碼總結(jié)

第一種：沒(méi)有返回值的頁(yè)面跳轉(zhuǎn)

第二種：帶有返回值的頁(yè)面跳轉(zhuǎn)

————————————

FActivity.java

public?class?FActivity?extends?Activity?{
????private?Button?bt1;
????private?Button?bt2;
????private?TextView?tv;
????@Override
????protected?void?onCreate(Bundle?savedInstanceState)?{
????????super.onCreate(savedInstanceState);
????????setContentView(R.layout.factivity);
????????/*
?????????*?通過(guò)點(diǎn)擊bt1實(shí)現(xiàn)頁(yè)面之間的跳轉(zhuǎn)
?????????*?1.?通過(guò)startActivity的方式來(lái)實(shí)現(xiàn)
?????????*?1>初始化Intent?
?????????*
?????????*/
????????bt1?=?(Button)?findViewById(btn1_first);
????????bt2?=?(Button)?findViewById(btn2_second);
????????mContext?=?this;
????????tv?=?(TextView)?findViewById(R.id.textView1);
????????//bt1注冊(cè)一個(gè)點(diǎn)擊事件
????????bt1.setOnClickListener(new?OnclickListener()?{
????????????@Override
????????????public?void?onClick(View?v)?{
????????????????/*初始化一個(gè)intent?
?????????????????*第一個(gè)參數(shù)：上下文對(duì)象this
?????????????????*第二個(gè)參數(shù)：目標(biāo)文件
?????????????????*
?????????????????*（第一個(gè)參數(shù)第二種填寫方法??可填FActivity.this）
?????????????????*
?????????????????*/
????????????????Intent?intent?=?new?Intent(FActivity.this,?SActivity.class);
????????????????startActivity(intent);
????????????}????
????????});
????????//bt2注冊(cè)一個(gè)點(diǎn)擊事件
????????/*
?????????*?通過(guò)startActivityForresult
?????????*
?????????*/
????????bt2.setOnClickListener(new?OnclickListener()?{
????????????@Override
????????????public?void?onClick(View?v)?{
????????????????/*初始化一個(gè)intent?*/
????????????????Intent?intent?=?new?Intent(mContext.this,?SActivity.class);
????????????????/*?startActivityForResult
?????????????????*?第一個(gè)參數(shù)是Intent對(duì)象
?????????????????*?第二個(gè)參數(shù)是請(qǐng)求的一個(gè)標(biāo)識(shí)
?????????????????*/
????????????????startActivityForResult(intent,?1);
????????????????}
?????????});
????????/*?
?????????*?通過(guò)startActivityForresult跳轉(zhuǎn)，接受返回?cái)?shù)據(jù)的方法
?????????*
?????????*?requestCode:?請(qǐng)求的標(biāo)識(shí)，可通過(guò)此標(biāo)識(shí)接收不同的返回值
?????????*?resultCode:?第二個(gè)頁(yè)面返回的標(biāo)識(shí)?，可通過(guò)此標(biāo)識(shí)判斷值是哪個(gè)頁(yè)面返回的數(shù)據(jù)
?????????*?data:?第二個(gè)頁(yè)面回傳的數(shù)據(jù)
?????????*/
????????@Override
????????protected?void?onActivityResult(int?requestCode,?int?resultCode,?Intent?data)?{
????????????super.onActivityResult(requestCode,?resultCode,?data);
????????????if(requestCode?==?1?&&?resultCode?==?2)?{
????????????????String?content?=?data.getStringExtra("data");
????????????????//將回傳回來(lái)的數(shù)據(jù)放到TextView中
????????????????tv.setText(content);
????????????}
????????}
????}
}

————————————

fativity.xml

<Button
????android:?id="@+id/btn1_first"
????android:?layout_width="match_parent"
????android:?layout_height="wrap_content"
????android:?text="第一種啟動(dòng)方式"?/>
<Button
????android:?id="@+id/btn2_second"
????android:?layout_width="match_parent"
????android:?layout_height="wrap_content"
????android:?text="第二種啟動(dòng)方式"?/>
<TextView
????android:?id="@+id/textView1"
????android:?layout_width="match_parent"
????android:?layout_height="wrap_content"
????android:?text="把第二個(gè)頁(yè)面回傳的數(shù)據(jù)顯示出來(lái)"?/>

————————————

SActivity.java

public?class?SAactivity?extends?Activity?{
????private?Button?bt;
????//回傳的數(shù)據(jù)
????private?String?content?=?"你好";
????@Override
????protected?void?onCreate(Bundle?saveInstanceState)?{
????????super.onCreate(savedInstanceState);
????????setContentView(R.layout.sactivity);
????????/*
?????????*第二個(gè)頁(yè)面什么時(shí)候給第一個(gè)頁(yè)面回傳數(shù)據(jù)
?????????*
?????????*?回傳第一個(gè)頁(yè)面的實(shí)際上是一個(gè)Intent對(duì)象
?????????*
?????????*/
????????bt?=?(Button)?findViewById(R.id.button1);
????????bt.setOnClickListener(new?OnClickListener()?{
????????????@Override
????????????public?void?onClick(View?v)?{
????????????????Intent?data?=?new?Intent();?
????????????????//存儲(chǔ)回傳數(shù)據(jù)
????????????????data.putExtra("data",?content);
????????????????//第一個(gè)參數(shù)，結(jié)果碼
????????????????setResult(2,?data);
????????????????//結(jié)束當(dāng)前頁(yè)面
????????????????finish();
????????????}
????????});
????}
}

————————————

sactivity.xml

<Button
????android:?id="@+id/button1"
????android:?layout_width="match_parent"
????android:?layout_height="warp_content"?
????android:?text="Button"/>

————————————

Manifest.xml

<activity
????android:?name?=?"com.imooc.imoocdemonintent.MainActivity"
????android:?label?=?"@string/app_name"?>
????/*intent-filter?代表哪個(gè)頁(yè)面首先啟動(dòng)*/
????/*
????<intent-filter>
????????<action?android:?name="android.intent.action.MAIN"?/>
????????<category?android:?name="android.intent.category.LAUNCHER"
????</intent-filter>
????*/
</activity>

<activity
????android:?name?=?"com.imooc.imoocdemonintent.FActivity"
????android:?label?=?"@string/app_name"?>
????<intent-filter>
????????<action?android:?name="android.intent.action.MAIN"?/>
????????<category?android:?name="android.intent.category.LAUNCHER"
????</intent-filter>
</activity>

<activity
????android:?name?=?"com.imooc.imoocdemonintent.SActivity"
????android:?label?=?"@string/app_name"?>
</activity>