Android旋转形状使用java代码

Question

我有这样的XML格式：

XML：

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
  <item>
    <rotate
      android:fromDegrees="45"
      android:toDegrees="45"
      android:pivotX="13%"
      android:pivotY="-40%">
      <shape
        android:shape="rectangle" >
        <solid android:color="#FFFFFFFF" />
      </shape>
    </rotate>
  </item>
</layer-list>

我想用不带xml的java代码实现它，怎么做？

Answer 1

您需要创建LayerDrawable的实例，您可以阅读有关课程here的更多信息。为类构造函数提供一个Drawable对象数组。在您的情况下，Drawable对象应该是RotateDrawable类型（更多信息here）

Answer 2

好的，现在我知道怎么做了

java代码：

public class MainActivity extends AppCompatActivity {

    private String[] mNavigationDrawerItemTitles;
    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    Toolbar toolbar;
    private CharSequence mDrawerTitle;
    private CharSequence mTitle;
    android.support.v7.app.ActionBarDrawerToggle mDrawerToggle;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTitle = mDrawerTitle = getTitle();
        mNavigationDrawerItemTitles = getResources().getStringArray(R.array.navigation_drawer_items_array);
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.left_drawer);

        setupToolbar();

        DataModel[] drawerItem = new DataModel[3];

        drawerItem[0] = new DataModel(R.drawable.connect, "Connect");
        drawerItem[1] = new DataModel(R.drawable.connect, "Fixtures");

        getSupportActionBar().setDisplayHomeAsUpEnabled(false);
        getSupportActionBar().setHomeButtonEnabled(true);

        DrawerItemCustomAdapter adapter = new DrawerItemCustomAdapter(this, R.layout.list_view_item_row, drawerItem);
        mDrawerList.setAdapter(adapter);
        mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerLayout.setDrawerListener(mDrawerToggle);
        setupDrawerToggle();

    }

    private class DrawerItemClickListener implements ListView.OnItemClickListener {

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            selectItem(position);
        }

    }

    private void selectItem(int position) {

        ConnectFragment fragment = null;
        switch (position) {

            case 0:
                fragment = new ConnectFragment();
                break;

            case 1:
                Intent a = new Intent(MainActivity.this, NewTest.class);
                startActivity(a);
                break;

            default:
                break;

        }
        Toast.makeText(this, "Selected Item Position::" + position, Toast.LENGTH_LONG).show();

        if (fragment != null) {
            FragmentManager fragmentManager = getSupportFragmentManager();
            int commit = fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();

            mDrawerList.setItemChecked(position, true);
            mDrawerList.setSelection(position);
            setTitle(mNavigationDrawerItemTitles[position]);
            mDrawerLayout.closeDrawer(mDrawerList);

        } else {
            Log.e("MainActivity", "Error in creating fragment");
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void setTitle(CharSequence title) {
        mTitle = title;
        getSupportActionBar().setTitle(mTitle);
    }

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        mDrawerToggle.syncState();
    }

    void setupToolbar() {
        toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
    }

    void setupDrawerToggle() {
        mDrawerToggle = new android.support.v7.app.ActionBarDrawerToggle(this, mDrawerLayout, toolbar, R.string.app_name, R.string.app_name);
        //This is necessary to change the icon of the Drawer Toggle upon state change.
        mDrawerToggle.syncState();
    }
}