Activity

Activity

<activity android:name=".MainActivity"
android:label="task"
android:theme="@style/Theme.Appcompat.Light.NoActionBar">

launchMode启动属性
intent-filter:启动activity

Activity的生命周期
onCreate()->created->onStart()->started->onResume()->Resumed->onPause()->Paused->onStop()->stoped->onDestory()->destoryed
进入activity：create start resume
接电话：pause
退出activity：pause stop destory

跳转和数据的传递
显式跳转和隐式跳转

1.Intent intent = new Intent(AActivity.this, BActivity.class);
startActivity(intent);
2.Intent intent = new Intent();
intent.setClass(AActivity.this, BActivity.class);
startActivity(intent);
3.Intent intent = new Intent();
intent.setClassName(AActivity.this, "com.skypan.helloworld.jump.BActivity");
startActivity(intent);
4.Intent intent = new Intent();
intent.setComponent(new ComponentName(AActivity.this,"com.skypan.helloworld.jump.BActivity" ));
startActivity(intent);

//隐式调用

Intent intent = new Intent();
intent.setAction("com.skypan.test.BActivity");
startActivity(intent);
<activity android:name=".jump.BActivity"
android:label="B">
<intent-filter>
 <action android:name="com.skypan.test.BActivity"/>
 <category android:name="android.intent.category.DEFAULT"/>
 </intent-filter>
 ..

activity之间的数据传递
startActivityForResult:启动Activity，结束后返回结果

public void onClick(View v){
Intent intent = new Intent(Activity.this, BActivity.class);
Bundle bundle = new Bundle();
//数据的传递是通过Bundle，intent.putExtras();后台也是new一个bundle
bundle.putString("name","天哥");
bundle.putInt("number",88);
intent.putExtras(bundle);
startActivity(intent);//传递2个数据
}

BActivity:
private TextView mTvTitle;
protected void onCreate(@Nullable Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    mTvTitle = (TextView) findById
    Bundle bundle = getIntent().getExtras();
    String name = bundle.getString("name");
Int number =    bundle.getInt("number");
    mTvTitle.setText(name+","+number);

}