Android代码笔记
Android代码笔记
返回数据给上一个Activity
FirstActivity：
Intent Intent = new Intent(FirstAcitivty.this, SecondActivity.class);
startActivityForResult(intent, 1);
SecondActivity:
Intent intent = new Intent();
intent.putExtra(“date”,”hello world!”);
setResult(RESULT_OK, intent);
FirstAcitvity:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case 1:
if (resultCode == RESULT_OK) {
String returnedData = data.getStringExtra(“data_return”);
Log.d(“FirstActivity”, returnedData);
}
break;
default:
}
}
调用系统拨号
Intent intent = new Intent(Intent.ACTION_DIAL);
intent.setData(Uri.parse(“tel:10086”));
startActivity(intent);
Activity启动模式
AndroidManifest.xml
<activity
android:launchMode = “standard” //默认启动模式
//singleTop //处于栈顶的Activity启动模式是singleTop，不会再次创建实例
//singleTask //查看栈中有是否有Activity实例，如果有不会再次创建实例
//singleInstance //被设定为这种模式的Activity将存在于新的返回栈中
统一退出所有Activity的类
public class ActivityCollector {
public static List
public static void addActivity(Activity activity) {
activities.add(activity);
}
public static void removeActivity(Activity activity) {
activities.remove(activity);
}
public static void finishAll() {
for (Activity activity : activities) {
if (!activity.isFinishing()) {
activity.finish();
}
}
}
}
比较好的传递数据的代码习惯
接收数据的Activity：
public class SecondActivity extends BaseActivity {
public static void actionStart(Context context, String data1, String data2) {
Intent intent = new Intent(context, SecondActivity.class);
intent.putExtra(“param1”, data1);
intent.putExtra(“param2”, data2);
context.startActivity(intent);
}
}
发送数据的activity类
button1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
SecondActivity.actionStart(FirstActivity.this, “data1”, “data2”);
}
});
自定义标题栏控件
public class TitleLayout extends LinearLayout {
public TitleLayout(Context context, AttributeSet attrs) {
super(context, attrs);
LayoutInflater.from(context).inflate(R.layout.title, this);
//找控件 设置监听
}
}