Android Studio 1-7 SharedPreferences存储 与 SD卡存储
今天主要学习了 SP存入SD卡 的应用 主要有如下几点
今日项目——app的引导页
最后一页时 可以选择主动跳过 或者等待五秒后自动跳转
并且 在第二次开启app时 不再显示 紧接着咱们来看看效果
主要逻辑在于将数据存入SD卡 记得加权限 话不多说 up code
1、MainActivity布局与java代码
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<android.support.v4.view.ViewPager
android:id="@+id/vp"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
<LinearLayout
android:id="@+id/lin_id"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_alignBottom="@id/vp"
android:layout_marginBottom="200dp"></LinearLayout>
</RelativeLayout>
package com.example.app2;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.LinearLayout;
import com.example.app2.fragment.OneFragment;
import com.example.app2.fragment.ThreeFragment;
import com.example.app2.fragment.TwoFragment;
import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
public class MainActivity extends AppCompatActivity {
private ViewPager vp;
private List<Fragment> list = new ArrayList<>();
private List<ImageView> image = new ArrayList<>();
private Handler handler = new Handler();
private LinearLayout linId;
private boolean flag;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
vp = (ViewPager) findViewById(R.id.vp);
linId = (LinearLayout) findViewById(R.id.lin_id);
SharedPreferences name = getSharedPreferences("name", MODE_PRIVATE);
flag = name.getBoolean("gg",false);
if (flag){
Intent intent = new Intent(MainActivity.this, Main2Activity.class);
startActivity(intent);
}else{
init();
SharedPreferences.Editor edit = name.edit();
edit.putBoolean("gg",true);
edit.commit();
}
}
private void init() {
list.add(new OneFragment());
list.add(new TwoFragment());
list.add(new ThreeFragment());
vp.setAdapter(new FragmentPagerAdapter(getSupportFragmentManager()) {
@Override
public Fragment getItem(int i) {
return list.get(i);
}
@Override
public int getCount() {
return list.size();
}
});
final Timer timer = new Timer();
timer.schedule(new TimerTask() {
int index = -1;
@Override
public void run() {
handler.post(new Runnable() {
@Override
public void run() {
vp.setCurrentItem(++index);
}
});
if (index == (list.size()-1)){
timer.cancel();
}
}
},0,3000);
for (int i = 0; i < list.size(); i++) {
ImageView imageView = new ImageView(this);
imageView.setImageResource(R.drawable.drw_false);
image.add(imageView);
linId.addView(imageView);
}
image.get(0).setImageResource(R.drawable.drw_true);
vp.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int i, float v, int i1) {
}
@Override
public void onPageSelected(int i) {
for (int j = 0; j < image.size(); j++) {
if (j == i){
image.get(j).setImageResource(R.drawable.drw_true);
}else{
image.get(j).setImageResource(R.drawable.drw_false);
}
}
}
@Override
public void onPageScrollStateChanged(int i) {
}
});
}
}
跳转之后的页面布局与java代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Main2Activity">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="他来了 他来了"
android:textSize="50dp"
android:gravity="center"/>
</LinearLayout>
package com.example.app2;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class Main2Activity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
}
}
2、共三页Fragmemt的布局与java代码
第一页
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
tools:context=".fragment.OneFragment">
<!-- TODO: Update blank fragment layout -->
<ImageView
android:id="@+id/image_id1"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</FrameLayout>
package com.example.app2.fragment;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import com.example.app2.R;
/**
* A simple {@link Fragment} subclass.
*/
public class OneFragment extends Fragment {
public OneFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View inflate = inflater.inflate(R.layout.fragment_one, container, false);
ImageView imageView = inflate.findViewById(R.id.image_id1);
imageView.setImageResource(R.mipmap.ic_launcher);
return inflate;
}
}
第二页
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
tools:context=".fragment.TwoFragment">
<!-- TODO: Update blank fragment layout -->
<ImageView
android:id="@+id/image_id2"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>
package com.example.app2.fragment;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import com.example.app2.R;
/**
* A simple {@link Fragment} subclass.
*/
public class TwoFragment extends Fragment {
public TwoFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View inflate = inflater.inflate(R.layout.fragment_two, container, false);
ImageView imageView = inflate.findViewById(R.id.image_id2);
imageView.setImageResource(R.mipmap.ic_launcher);
return inflate;
}
}
第三页 (主要)
<?xml version="1.0" encoding="utf-8"?>
<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"
tools:context=".fragment.ThreeFragment">
<ImageView
android:id="@+id/image_id3"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
<Button
android:id="@+id/btn_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:layout_alignParentRight="true"/>
<Button
android:id="@+id/btn_inter"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:text="进入"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"/>
</RelativeLayout>
package com.example.app2.fragment;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import com.example.app2.Main2Activity;
import com.example.app2.R;
import java.util.Timer;
import java.util.TimerTask;
/**
* A simple {@link Fragment} subclass.
*/
public class ThreeFragment extends Fragment {
private int count = 9;
private Handler handler = new Handler();
public ThreeFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, final ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View inflate = inflater.inflate(R.layout.fragment_three, container, false);
ImageView imageView = inflate.findViewById(R.id.image_id3);
final Button text = inflate.findViewById(R.id.btn_text);
Button inter = inflate.findViewById(R.id.btn_inter);
//点击按钮跳转
inter.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), Main2Activity.class);
startActivity(intent);
}
});
//设置图片
imageView.setImageResource(R.mipmap.ic_launcher);
final Timer timer = new Timer();
timer.schedule(new TimerTask() {
@Override
public void run() {
count--;
handler.post(new Runnable() {
@Override
public void run() {
text.setText("倒计时:"+count);
if (count == 0){
Intent intent = new Intent(getActivity(), Main2Activity.class);
startActivity(intent);
getActivity().finish();
}
}
});
}
},0,1000);
return inflate;
}
}