如何編碼，以便在Android應用上裁剪圖片？

Question

這裏是我的java：

public class MainPage extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, View.OnClickListener { 

TabLayout tabLayout; 
ViewPageAdapter viewPageAdapter; 
ViewPager viewPager; 
ImageView pfp; 
Bitmap bitmap_one; 

private String UPLOAD_URL = "http://.php"; 
private int PICK_IMAGE_REQUEST = 1; 
private String KEY_IMAGE = "image"; 

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

    String username = getIntent().getStringExtra("Username"); 
    TextView tv = (TextView)findViewById(R.id.usernameND); 
    tv.setText(username); 

    //id's 
    pfp = (ImageView) findViewById(R.id.imageView_one); 
    pfp.setOnClickListener(this); 


    //SearchIntent 
    Intent searchI = getIntent(); 
    if (Intent.ACTION_SEARCH.equals(searchI.getAction())) { 

     String query = searchI.getStringExtra(SearchManager.QUERY); 
     Toast.makeText(MainPage.this, query, Toast.LENGTH_SHORT).show(); 
    } 

    //Toolbar 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 
    getSupportActionBar().setTitle(null); 

    //Tabs 
    tabLayout = (TabLayout) findViewById(R.id.tablayout_two); 
    viewPager = (ViewPager) findViewById(R.id.viewPager_two); 
    viewPageAdapter = new ViewPageAdapter(getSupportFragmentManager()); 
    viewPageAdapter.addFragments(new FeedFragment(), "Feed"); 
    viewPageAdapter.addFragments(new MessagesFragment(), "Messages"); 
    viewPageAdapter.addFragments(new NotificationsFragment(), "Notifications"); 
    viewPager.setAdapter(viewPageAdapter); 
    tabLayout.setupWithViewPager(viewPager); 


    //FloatingActionButton 
    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
    fab.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
     } 
    }); 


    //NavigationDrawer 
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
      this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close); 
    drawer.setDrawerListener(toggle); 
    toggle.syncState(); 

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view); 
    navigationView.setNavigationItemSelectedListener(this); 
} 

@Override 
public void onBackPressed() { 
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    if (drawer.isDrawerOpen(GravityCompat.START)) { 
     drawer.closeDrawer(GravityCompat.START); 
    } else { 
     super.onBackPressed(); 
    } 
} 

@Override 
public boolean onNavigationItemSelected(MenuItem item) { 
    int id = item.getItemId(); 

    if (id == R.id.profile) { 

     Intent i = new Intent(this, Profile.class); 
     startActivity(i); 

    } else if (id == R.id.whatshot) { 

     Intent i = new Intent(this, WhatsHot.class); 
     startActivity(i); 

    } else if (id == R.id.trending) { 

     Intent i = new Intent(this, Trending.class); 
     startActivity(i); 

    } else if (id == R.id.radioplayer) { 

     Intent i = new Intent(this, Radio.class); 
     startActivity(i); 

    } else if (id == R.id.musicplayer) { 

     Intent i = new Intent(this, MusicPlayer.class); 
     startActivity(i); 

    } else if (id == R.id.settings) { 

     Intent i = new Intent(this, Settings.class); 
     startActivity(i); 

    } else if (id == R.id.info) { 

     Intent i = new Intent(this, Info.class); 
     startActivity(i); 

    } 

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); 
    drawer.closeDrawer(GravityCompat.START); 
    return true; 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 

    getMenuInflater().inflate(R.menu.main_menu, menu); 

    SearchView searchView = (SearchView) menu.findItem(R.id.search_view).getActionView(); 
    SearchManager searchManager = (SearchManager) getSystemService(SEARCH_SERVICE); 
    searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName())); 

    return super.onCreateOptionsMenu(menu); 
} 


//ImageInfo 
private void showFileChooser() { 
    Intent intent = new Intent(); 
    intent.setType("image/*"); 
    intent.setAction(Intent.ACTION_GET_CONTENT); 
    startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST); 
} 

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 

    if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) { 
     Uri filePath = data.getData(); 
     try { 

      bitmap_one = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath); 
      pfp.setImageBitmap(bitmap_one); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
    } 
} 



//Typeface 
private void initTypeface() { 

    Typeface myTypeface = Typeface.createFromAsset(getAssets(), "fonts/Amble-Regular.ttf"); 
    TextView text = (TextView) findViewById(R.id.toolbarTitle); 
    text.setTypeface(myTypeface); 

    myTypeface = Typeface.createFromAsset(getAssets(), "fonts/Amble-Regular.ttf"); 
    text = (TextView) findViewById(R.id.usernameND); 
    text.setTypeface(myTypeface); 

} 

@Override 
public void onClick(View v) { 
    if (v == pfp) { 
     showFileChooser(); 
    } 
} 

}

這裏是我的xml：

<android.support.v4.widget.DrawerLayout  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:id="@+id/drawer_layout" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:fitsSystemWindows="true" 
tools:openDrawer="start"> 

<include 
    layout="@layout/app_bar_main_page" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" /> 

<android.support.design.widget.NavigationView 
    android:id="@+id/nav_view" 
    android:layout_width="wrap_content" 
    android:layout_height="match_parent" 
    android:background="#e9eaea" 
    app:itemIconTint="#2A363B" 
    app:itemTextColor="#2A363B" 
    android:layout_gravity="start" 
    android:fitsSystemWindows="true" 
    app:headerLayout="@layout/nav_header_main_page" 
    app:menu="@menu/main_page_drawer"> 

    <ImageView 
     android:id="@+id/imageView_one" 
     android:layout_width="90dp" 
     android:scaleType="fitCenter" 
     android:padding="5dp" 
     android:background="#2A363B" 
     android:adjustViewBounds="true" 
     android:onClick="pfpClick" 
     android:layout_marginLeft="8dp" 
     android:layout_marginTop="20dp" 
     android:layout_height="90dp"/> 

    <TextView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_marginTop="108dp" 
     android:text="" 
     android:textColor="#FFf" 
     android:textSize="18sp" 
     android:id="@+id/usernameND" 
     android:textAppearance="@style/TextAppearance.AppCompat.Body1" /> 

    <TextView 
     android:id="@+id/textView" 
     android:layout_marginTop="126dp" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:text="" /> 


    </android.support.design.widget.NavigationView> 

    </android.support.v4.widget.DrawerLayout> 

我想知道的是，我怎麼可以編寫我的應用程序等等的onclick我的ImageView的（ imageView_one）它打開一個窗口或編輯器，所以我可以將一張圖片裁剪成一個正方形，以便它適合放置在Imageview上。這是我想弄明白的。我是新來的機器人，所以謝謝你。

Answer 1

您可以簡單地通過使用此裁剪位圖圖像。

Bitmap.createScaledBitmap(bitmap, width, height, false);