在我的应用程序，我有三个活性

活动1

活动2

活动3

如何活动之间进行切换。

那么，如何才能做到这一点？

 公共布尔onOptionsItemSelected（菜单项项）
{

    开关（item.getItemId（））
    {
        案例R.id.settingOpt：
            意向意图=新的意图（这一点，SettingsForm.class）;
            this.startActivity（意向）;
            this.finish（）;
        打破;

        案例R.id.reminderOpt：
            意图int​​entR =新的意图（这一点，ReminderForm.class）;
            this.startActivity（intentR）;
        打破;

        案例R.id.helpOpt：
            意图int​​entH =新的意图（这一点，HelpForm.class）;
            this.startActivity（intentH）;
            this.finish（）;
        打破;

        案例R.id.shareOpt：
            意图份额=新的意图（android.content.Intent.ACTION_SEND）;
            share.setType（text / plain的）;
            share.putExtra（Intent.EXTRA_SUBJECT的东西分享名称）;
            share.putExtra（Intent.EXTRA_TEXTwww.gmail.com）;
            startActivity（Intent.createChooser（份额，共享LoveCycle的网站链接你的朋友））;
        打破;

        默认：

        返回super.onOptionsItemSelected（项目）;
    }

    返回true;
}
 

解决方案   

当我点击后退按钮从Activity3我应该总是去，而不是活性2至活动1，

使用以下对Activity3后退按钮preSS事件方法：

 的setResult（R.id.common_backToActivity1）;
 

和中活性2捕获的setResult如下，然后关闭此活动：

 保护无效onActivityResult（INT申请code，INT结果code，意图数据）{
        开关（结果code）{
        案例R.id.common_backToActivity1：
            closeActivity（）; //完成活性2​​在此方法
            打破;
        }
        super.onActivityResult（要求code，因此code，数据）;
    }
 

然后你会得到直接到活动1。

In my app I have three activity as

Activity 1

Activity 2

Activity 3

How to switch between activities.

So how can this be done?

 public boolean onOptionsItemSelected(MenuItem item)
{   

    switch (item.getItemId()) 
    {
        case R.id.settingOpt:                           
            Intent intent = new Intent(this, SettingsForm.class);
            this.startActivity(intent); 
            this.finish();
        break;         

        case R.id.reminderOpt:                          
            Intent intentR = new Intent(this, ReminderForm.class);
            this.startActivity(intentR);   
        break;

        case R.id.helpOpt:                          
            Intent intentH = new Intent(this, HelpForm.class);
            this.startActivity(intentH);  
            this.finish();
        break;

        case R.id.shareOpt:                             
            Intent share = new Intent(android.content.Intent.ACTION_SEND);
            share.setType("text/plain");
            share.putExtra(Intent.EXTRA_SUBJECT, "Name of the thing to share");
            share.putExtra(Intent.EXTRA_TEXT, "www.gmail.com");
            startActivity(Intent.createChooser(share, "Share LoveCycle's website link with your friends"));
        break;

        default:

        return super.onOptionsItemSelected(item);       
    }

    return true;
}

When I click back button from Activity3 I should always went to Activity1,instead of Activity2:

Use following method on back button press event in Activity3:

setResult(R.id.common_backToActivity1);

And in Activity2 capture that setResult as follows and close this Activity:

protected void onActivityResult(int requestCode, int resultCode,Intent data) {
        switch(resultCode){
        case R.id.common_backToActivity1:
            closeActivity();  //Finish Activity2 in this method
            break;  
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

Then you will get directly to Activity1.